Merge pull request '对齐详情替换模型并支持整套图片' (#68) from codex/detail-replacement-full-set into main

app/(admin)/settings/_components/local-ai-sections/image-pipeline-sections.tsx

@@ -2377,7 +2377,9 @@ export function LocalAiImagePipelineSections({
             items={[
               {
                 label:
-                  extendConfig.provider === "vip98k"
+                  extendConfig.provider === "fal"
+                    ? "Bria 扩图服务"
+                    : extendConfig.provider === "vip98k"
                     ? "VIP98K 服务商"
                     : "阿里云服务商",
                 tone: "enabled",
@@ -2391,7 +2393,11 @@ export function LocalAiImagePipelineSections({
         }
         title="图像拓展API配置"
       >
-        {extendConfig.provider === "vip98k" ? (
+        {extendConfig.provider === "fal" ? (
+          <div className="rounded-lg border bg-muted/40 p-4 text-sm">
+            使用 Bria 生成新增区域并保留原图主体和文字。密钥从已启用的 fal 官方服务商读取。
+          </div>
+        ) : extendConfig.provider === "vip98k" ? (
           <div className="rounded-lg border bg-muted/40 p-4 text-sm">
             使用 VIP98K 的 image-expansion 模型。API Key 从“AI 模型设置”中的
             VIP98K 服务商读取，仅在这里维护扩展比例。

app/(admin)/settings/_lib/types.ts

@@ -274,7 +274,7 @@ export type EnhanceConfig = {
 };
 
 export type ExtendConfig = {
-  provider: "vip98k" | "dashscope";
+  provider: "vip98k" | "dashscope" | "fal";
   xScale: string;
   yScale: string;
 };

app/(admin)/settings/admin-settings-client.tsx

@@ -2576,7 +2576,7 @@ export function AdminSettingsClient() {
 
   // 图像拓展API配置状态
   const [extendConfig, setExtendConfig] = useState({
-    provider: "dashscope" as "vip98k" | "dashscope",
+    provider: "dashscope" as "vip98k" | "dashscope" | "fal",
     xScale: "1.5", // X轴放大倍数
     yScale: "1.5", // Y轴放大倍数
   });
@@ -2891,12 +2891,12 @@ export function AdminSettingsClient() {
   useEffect(() => {
     if (extendConfigData?.setting?.value) {
       const config = extendConfigData.setting.value as {
-        provider?: "vip98k" | "dashscope";
+        provider?: "vip98k" | "dashscope" | "fal";
         xScale?: number;
         yScale?: number;
       };
       setExtendConfig({
-        provider: config.provider === "vip98k" ? "vip98k" : "dashscope",
+        provider: config.provider === "vip98k" || config.provider === "fal" ? config.provider : "dashscope",
         xScale: config.xScale ? String(config.xScale) : "1.5",
         yScale: config.yScale ? String(config.yScale) : "1.5",
       });

app/(chat)/api/chat/_lib/detail-replacement.ts

@@ -4,7 +4,8 @@ import { fetchImageBufferFromUrl } from "@/lib/ai/rmbg/service";
 import { getLanguageModelById } from "@/lib/ai/dynamic-provider";
 import {
   DETAIL_REPLACEMENT_IMAGE_MODEL_CONFIG_KEY,
-  normalizeDetailReplacementImageModelConfig,
+  findConfiguredDetailReplacementImageModel,
+  isDetailReplacementImageModel,
 } from "@/lib/ai/detail-replacement-image-model-config";
 import {
   compositeReplacementWithReferenceLocks,
@@ -29,7 +30,6 @@ import {
 } from "@/lib/db/queries";
 import { uploadFile } from "@/lib/storage/service";
 import { bufferToArrayBuffer } from "./persistence";
-import { isVideoProviderType } from "./video-models";
 import type { AgentPresetMessageImagePart } from "./agent-scene-workflow";
 import type { PostRequestBody } from "../schema";
 
@@ -2161,22 +2161,10 @@ export async function resolveDirectReplacementModelRef(params: {
   models?: Awaited<ReturnType<typeof getEnabledAiModelsWithProvider>>;
 }) {
   const models = params.models || (await getEnabledAiModelsWithProvider(false));
-  const imageModels = models.filter(
-    ({ model, provider }) =>
-      model.supportsImageGen &&
-      !model.isSubModel &&
-      !isVideoProviderType(provider?.type, model),
-  );
   const configuredModelSetting = await getSystemSetting({
     key: DETAIL_REPLACEMENT_IMAGE_MODEL_CONFIG_KEY,
   }).catch(() => null);
-  const configuredModelId = normalizeDetailReplacementImageModelConfig(
+  const configuredModel = findConfiguredDetailReplacementImageModel(models, configuredModelSetting?.value);
-    configuredModelSetting?.value,
-  ).modelId;
-  const configuredModel = imageModels.find(
-    ({ model }) =>
-      model.id === configuredModelId || model.modelId === configuredModelId,
-  );
   if (configuredModel) {
     return configuredModel.model.id;
   }
@@ -2190,6 +2178,7 @@ export async function resolveDirectReplacementModelRef(params: {
     return routedModel;
   }
 
+  const imageModels = models.filter(isDetailReplacementImageModel);
   const preferred =
     imageModels.find(({ model }) => model.isDefault) ||
     imageModels.find(({ provider }) => String(provider?.type || "").includes("image")) ||

app/(chat)/api/chat/_lib/image-generation-failure.ts

@@ -0,0 +1,47 @@
+import { saveMessages } from "@/lib/db/queries";
+import type { ImageGenerationStatusStreamPayload } from "@/lib/canvas/image-generation-status";
+import { formatRequestFailure, getRequestFailureDetails } from "@/lib/request-error";
+import { safeWriteStreamChunk, type StreamWriter, writeAssistantTextChunk, writeStructuredDataChunk } from "./stream";
+
+export async function reportImageGenerationFailure(params: {
+  writer: StreamWriter;
+  chatId: string;
+  userMessageId: string;
+  messageId: string;
+  error: unknown;
+  label: string;
+}) {
+  const failure = getRequestFailureDetails(params.error, "图片生成失败");
+  const status: ImageGenerationStatusStreamPayload = {
+    phase: "failed",
+    userMessageId: params.userMessageId,
+    requestId: params.messageId,
+    failure,
+  };
+  const text = formatRequestFailure(failure, params.messageId);
+  const parts = [
+    { type: "text", text },
+    { type: "data-imageGenerationStatus", data: status },
+  ];
+  writeStructuredDataChunk(params.writer, "data-imageGenerationStatus", status, `${params.label}:status`);
+  safeWriteStreamChunk(params.writer, {
+    type: "data-appendMessage",
+    data: JSON.stringify({ id: params.messageId, role: "assistant", parts }),
+  }, params.label);
+  writeAssistantTextChunk(params.writer, "<!-- IMAGE_GENERATION_END -->", `${params.label}:end`);
+  // History carries the same terminal state when the browser loses the stream.
+  await saveMessages({ messages: [{
+    id: params.messageId,
+    chatId: params.chatId,
+    role: "assistant",
+    parts,
+    attachments: [],
+    createdAt: new Date(),
+    videoStorageStatus: null,
+    temporaryVideoUrl: null,
+    permanentVideoUrl: null,
+    archivedAt: null,
+    videoMetadata: null,
+  }] });
+  return text;
+}

app/(chat)/api/chat/_lib/stream.ts

@@ -208,6 +208,7 @@ export function writeImageGenerationStatusChunk(
   writer: StreamWriter,
   params: {
     phase: "queued" | "processing" | "finalizing" | "failed" | "completed";
+    userMessageId?: string;
     providerType?: string | null;
     modelName?: string | null;
     imageCount?: number | null;
@@ -223,6 +224,7 @@ export function writeImageGenerationStatusChunk(
     "data-imageGenerationStatus",
     {
       phase: params.phase,
+      userMessageId: params.userMessageId,
       providerType: normalizeImageLoadingProviderType(params.providerType),
       modelName: String(params.modelName || "").trim() || undefined,
       imageCount:

app/(chat)/api/chat/route.ts

@@ -426,6 +426,8 @@ import {
   type VideoModeType,
 } from "./_lib/video-models";
 
+import { reportImageGenerationFailure } from "./_lib/image-generation-failure";
+
 const chatApiLogger = createLogger("chat.route");
 const createUIMessageStream: typeof createAiUIMessageStream = (options) =>
   createAiUIMessageStream({ ...options, execute: (writer) => trackRuntimeWork(() => options.execute(writer)) });
@@ -446,16 +448,6 @@ function assertGeneratedImageMarkdownHasImage(markdown: string, modelLabel: stri
   throw new Error(`${modelLabel} 未返回可用图片：${reason.slice(0, 160)}`);
 }
 
-function getPublicImageGenerationErrorText(error: unknown, requestId: string) {
-  const message = error instanceof Error ? error.message : String(error || "");
-  const publicMessage = getUserFacingImageGenerationErrorMessage(error);
-  if (!message || (publicMessage === message && INTERNAL_IMAGE_GENERATION_FAILURE_PATTERN.test(message))) {
-    return `图片生成失败，请稍后重试。若连续失败，请联系管理员。\n\n请求编号：${requestId}`;
-  }
-  return `${publicMessage}\n\n请求编号：${requestId}`;
-}
-
-
 const AGENT_REPLACEMENT_PARALLEL_WORKER_COUNT = Math.max(
   1,
   Math.min(8, Number(process.env.AGENT_REPLACEMENT_PARALLEL_WORKER_COUNT || 6) || 6),
@@ -5688,6 +5680,7 @@ export async function POST(request: Request) {
             writeImageGenerationStatusChunk(
               writer,
               {
+                userMessageId: message.id,
                 phase: "processing",
                 modelName: resolvedModelRef,
                 imageCount: replacementReferences.length,
@@ -6030,6 +6023,7 @@ export async function POST(request: Request) {
                           writeImageGenerationStatusChunk(
                             writer,
                             {
+                              userMessageId: message.id,
                               phase:
                                 queueStatus.status === "running"
                                   ? "processing"
@@ -6185,6 +6179,7 @@ export async function POST(request: Request) {
             writeImageGenerationStatusChunk(
               writer,
               {
+                userMessageId: message.id,
                 phase: successCount > 0 ? "completed" : "failed",
                 modelName: resolvedModelDisplayName,
                 imageCount: successCount,
@@ -6417,6 +6412,7 @@ export async function POST(request: Request) {
               writeImageGenerationStatusChunk(
                 writer,
                 {
+                  userMessageId: message.id,
                   phase: "processing",
                   modelName:
                     selectedAgentPreset.defaultModel?.displayName ||
@@ -6968,6 +6964,7 @@ export async function POST(request: Request) {
                             writeImageGenerationStatusChunk(
                               writer,
                               {
+                                userMessageId: message.id,
                                 phase:
                                   queueStatus.status === "running"
                                     ? "processing"
@@ -7293,6 +7290,7 @@ export async function POST(request: Request) {
                         writeImageGenerationStatusChunk(
                           writer,
                           {
+                            userMessageId: message.id,
                             phase:
                               queueStatus.status === "running"
                                 ? "processing"
@@ -7521,6 +7519,7 @@ export async function POST(request: Request) {
                           writeImageGenerationStatusChunk(
                             writer,
                             {
+                              userMessageId: message.id,
                               phase:
                                 queueStatus.status === "running"
                                   ? "processing"
@@ -7839,6 +7838,7 @@ export async function POST(request: Request) {
               writeImageGenerationStatusChunk(
                 writer,
                 {
+                  userMessageId: message.id,
                   phase: successCount > 0 ? "completed" : "failed",
                   modelName:
                     selectedAgentPreset.defaultModel?.displayName ||
@@ -8048,6 +8048,7 @@ export async function POST(request: Request) {
             writeImageGenerationStatusChunk(
               writer,
               {
+                userMessageId: message.id,
                 phase: "processing",
                 providerType: requestedModelProviderType,
                 modelName: finalModelId,
@@ -8086,6 +8087,7 @@ export async function POST(request: Request) {
                   writeImageGenerationStatusChunk(
                     writer,
                     {
+                      userMessageId: message.id,
                       phase: "processing",
                       ...directImageStatusPayload,
                     },
@@ -8178,6 +8180,7 @@ export async function POST(request: Request) {
               writeImageGenerationStatusChunk(
                 writer,
                 {
+                  userMessageId: message.id,
                   phase: "completed",
                   providerType: requestedModelProviderType,
                   modelName: directImageResult.model,
@@ -8198,42 +8201,16 @@ export async function POST(request: Request) {
             );
           } catch (directToolError) {
             chatApiLogger.error("[Chat API] Direct agent image generation failed:", directToolError);
-            const errorMessage = getDirectAgentToolErrorMessage(
+            const errorMessage = await reportImageGenerationFailure({
-              "generate_image",
+              writer, chatId: id, userMessageId: message.id,
-              directToolError,
+              messageId: assistantMessageId, error: directToolError,
-            );
+              label: "agent:generate_image:error",
-            await saveAssistantTextOnlyMessage({
-              chatId: id,
-              messageId: assistantMessageId,
-              text: errorMessage,
             });
-            writeAssistantTextChunk(
-              writer,
-              errorMessage,
-              "agent:generate_image:error",
-              assistantMessageId,
-            );
-            if (contextPayload?.source === "canvas") {
-              writeImageGenerationStatusChunk(
-                writer,
-                {
-                  phase: "failed",
-                  providerType: requestedModelProviderType,
-                  modelName: finalModelId,
-                },
-                "agent:generate_image:status-failed",
-              );
-            }
             writeAgentProgressChunk(
               writer,
               buildDirectAgentImageGenerateFailedProgress(errorMessage),
               "agent:generate_image:progress-failed",
             );
-            writeAssistantTextChunk(
-              writer,
-              "<!-- IMAGE_GENERATION_END -->",
-              "agent:generate_image:end-error",
-            );
           } finally {
             stopDirectImageKeepalive();
             if (stopDirectImageStatus) {
@@ -9195,6 +9172,7 @@ export async function POST(request: Request) {
               writeImageGenerationStatusChunk(
                 writer,
                 {
+                  userMessageId: message.id,
                   phase: "processing",
                   providerType: (languageModel as any).provider,
                   modelName: currentModelConfig?.displayName || actualModelId,
@@ -9282,6 +9260,7 @@ export async function POST(request: Request) {
                     chatApiLogger.warn("[Chat API] Record Gemini fallback health failure failed:", healthError);
                   });
                   chatApiLogger.error(`[Chat API] ❌ Fallback model ${candidate.model.displayName} (${candidate.provider.type}) failed:`, fallbackError);
+                  if (!shouldFailoverAiModelError(fallbackError)) throw fallbackError;
                 }
               }
 
@@ -9356,6 +9335,7 @@ export async function POST(request: Request) {
                       chatApiLogger.warn("[Chat API] Record Gemini cross-provider health failure failed:", healthError);
                     });
                     chatApiLogger.error(`[Chat API] ❌ Gemini cross-provider fallback model ${candidate.model.displayName} (${candidate.provider.type}) failed:`, fallbackError);
+                    if (!shouldFailoverAiModelError(fallbackError)) throw fallbackError;
                   }
                 }
               }
@@ -9423,6 +9403,7 @@ export async function POST(request: Request) {
               writeImageGenerationStatusChunk(
                 writer,
                 {
+                  userMessageId: message.id,
                   phase: "completed",
                   providerType: (languageModel as any).provider,
                   modelName: usedModelDisplayName,
@@ -9487,6 +9468,14 @@ export async function POST(request: Request) {
             }
           } catch (error) {
             chatApiLogger.error("[Chat API] Gemini generation error:", error);
+            let finalError = error;
+            if (!shouldFailoverAiModelError(error)) {
+              await reportImageGenerationFailure({
+                writer, chatId: id, userMessageId: message.id,
+                messageId: generateUUID(), error, label: "gemini:error",
+              });
+              return;
+            }
             chatApiLogger.info("[Chat API] Attempting failover to Volcano Vision...");
             
             // 故障转移：尝试使用火山引擎模型
@@ -9564,6 +9553,7 @@ export async function POST(request: Request) {
                       writeImageGenerationStatusChunk(
                         writer,
                         {
+                          userMessageId: message.id,
                           phase: "completed",
                           providerType: "volcano-vision",
                           modelName: volcanoModel.model.displayName || volcanoModel.model.modelId,
@@ -9629,47 +9619,14 @@ export async function POST(request: Request) {
               chatApiLogger.info("[Chat API] No Volcano Vision model available for failover");
             } catch (failoverError) {
               chatApiLogger.error("[Chat API] Failover to Volcano Vision also failed:", failoverError);
+              finalError = failoverError;
             }
             
             // 如果故障转移也失败，返回错误消息
-            const errorMessageId = generateUUID();
+            await reportImageGenerationFailure({
-            const errorText = getPublicImageGenerationErrorText(error, errorMessageId);
+              writer, chatId: id, userMessageId: message.id,
-            writeAssistantTextChunk(
+              messageId: generateUUID(), error: finalError, label: "gemini:error",
-              writer,
-              errorText,
-              "gemini:error",
-              errorMessageId,
-            );
-            
-            // 🆕 图片生成结束标记（失败）
-            writeAssistantTextChunk(
-              writer,
-              "<!-- IMAGE_GENERATION_END -->",
-              "gemini:image-end-failed",
-            );
-            
-            // 尝试保存错误消息
-            try {
-              await saveMessages({
-                messages: [
-                  {
-                    id: errorMessageId,
-                    chatId: id,
-                    role: "assistant",
-                    parts: [{ type: "text", text: errorText }],
-                    attachments: [],
-                    createdAt: new Date(),
-                    videoStorageStatus: null,
-                    temporaryVideoUrl: null,
-                    permanentVideoUrl: null,
-                    archivedAt: null,
-                    videoMetadata: null,
-                  },
-                ],
             });
-            } catch (saveError) {
-              chatApiLogger.error("[Chat API] Failed to save error message:", saveError);
-            }
           } finally {
             stopKeepalive?.();
           }
@@ -9867,6 +9824,7 @@ export async function POST(request: Request) {
               writeImageGenerationStatusChunk(
                 writer,
                 {
+                  userMessageId: message.id,
                   phase: "queued",
                   providerType: "fal-image",
                   modelName: modelDisplayName,
@@ -9973,6 +9931,7 @@ export async function POST(request: Request) {
               writeImageGenerationStatusChunk(
                 writer,
                 {
+                  userMessageId: message.id,
                   phase: "processing",
                   providerType: (languageModel as any).provider,
                   modelName: alibabaModelConfig?.displayName || actualModelId,
@@ -10070,6 +10029,7 @@ export async function POST(request: Request) {
                     chatApiLogger.warn("[Chat API] Record image fallback health failure failed:", healthError);
                   });
                   chatApiLogger.error(`[Chat API] ❌ Alibaba fallback model ${candidate.model.displayName} (${candidate.provider.type}) failed:`, fallbackError);
+                  if (!shouldFailoverAiModelError(fallbackError)) throw fallbackError;
                 }
               }
 
@@ -10204,6 +10164,7 @@ export async function POST(request: Request) {
                       chatApiLogger.warn("[Chat API] Record image cross-provider health failure failed:", healthError);
                     });
                     chatApiLogger.error(`[Chat API] ❌ Cross-provider failover failed: ${candidate.model.displayName} (${candidate.provider.type})`, crossError);
+                    if (!shouldFailoverAiModelError(crossError)) throw crossError;
                   }
                 }
               }
@@ -10271,6 +10232,7 @@ export async function POST(request: Request) {
               writeImageGenerationStatusChunk(
                 writer,
                 {
+                  userMessageId: message.id,
                   phase: "completed",
                   providerType: (languageModel as any).provider,
                   modelName: usedModelDisplayName,
@@ -10335,43 +10297,10 @@ export async function POST(request: Request) {
             chatApiLogger.error("[Chat API] Alibaba generation error:", error);
             
             // 返回错误消息
-            const errorMessageId = generateUUID();
+            await reportImageGenerationFailure({
-            const errorText = getPublicImageGenerationErrorText(error, errorMessageId);
+              writer, chatId: id, userMessageId: message.id,
-            writeAssistantTextChunk(
+              messageId: generateUUID(), error, label: "alibaba:error",
-              writer,
-              errorText,
-              "alibaba:error",
-              errorMessageId,
-            );
-            
-            // 🆕 图片生成结束标记（失败）
-            writeAssistantTextChunk(
-              writer,
-              "<!-- IMAGE_GENERATION_END -->",
-              "alibaba:image-end-failed",
-            );
-            
-            try {
-              await saveMessages({
-                messages: [
-                  {
-                    id: errorMessageId,
-                    chatId: id,
-                    role: "assistant",
-                    parts: [{ type: "text", text: errorText }],
-                    attachments: [],
-                    createdAt: new Date(),
-                    videoStorageStatus: null,
-                    temporaryVideoUrl: null,
-                    permanentVideoUrl: null,
-                    archivedAt: null,
-                    videoMetadata: null,
-                  },
-                ],
             });
-            } catch (saveError) {
-              chatApiLogger.error("[Chat API] Failed to save error message:", saveError);
-            }
           } finally {
             stopKeepalive?.();
           }
@@ -10500,6 +10429,7 @@ export async function POST(request: Request) {
               writeImageGenerationStatusChunk(
                 writer,
                 {
+                  userMessageId: message.id,
                   phase: "processing",
                   providerType: "volcano-vision",
                   modelName: volcanoModelConfig?.displayName || actualModelId,
@@ -10545,6 +10475,7 @@ export async function POST(request: Request) {
                     setImageFallbackModelCooldown(candidate.model.id, fallbackErrorMessage);
                   }
                   chatApiLogger.error(`[Chat API] ❌ Volcano fallback model ${candidate.model.displayName} (${candidate.provider.type}) failed:`, fallbackError);
+                  if (!shouldFailoverAiModelError(fallbackError)) throw fallbackError;
                 }
               }
               if (!fallbackSuccess) {
@@ -10711,6 +10642,7 @@ export async function POST(request: Request) {
               writeImageGenerationStatusChunk(
                 writer,
                 {
+                  userMessageId: message.id,
                   phase: "completed",
                   providerType: "volcano-vision",
                   modelName: usedModelDisplayName,
@@ -10775,44 +10707,10 @@ export async function POST(request: Request) {
             }
           } catch (error) {
             chatApiLogger.error("[Chat API] Volcano Vision generation error:", error);
-            const errorMessageId = generateUUID();
+            await reportImageGenerationFailure({
-            const errorText = getPublicImageGenerationErrorText(error, errorMessageId);
+              writer, chatId: id, userMessageId: message.id,
-            writeAssistantTextChunk(
+              messageId: generateUUID(), error, label: "volcano:error",
-              writer,
-              errorText,
-              "volcano:error",
-              errorMessageId,
-            );
-            
-            // 🆕 图片生成结束标记（失败）
-            writeAssistantTextChunk(
-              writer,
-              "<!-- IMAGE_GENERATION_END -->",
-              "volcano:image-end-failed",
-            );
-            
-            // 尝试保存错误消息
-            try {
-              await saveMessages({
-                messages: [
-                  {
-                    id: errorMessageId,
-                    chatId: id,
-                    role: "assistant",
-                    parts: [{ type: "text", text: errorText }],
-                    attachments: [], // 必须提供 attachments 字段
-                    createdAt: new Date(),
-                    videoStorageStatus: null,
-                    temporaryVideoUrl: null,
-                    permanentVideoUrl: null,
-                    archivedAt: null,
-                    videoMetadata: null,
-                  },
-                ],
             });
-            } catch (saveError) {
-              chatApiLogger.error("[Chat API] Failed to save error message:", saveError);
-            }
           } finally {
             stopKeepalive?.();
           }
@@ -11385,6 +11283,7 @@ export async function POST(request: Request) {
               writeImageGenerationStatusChunk(
                 dataStream as unknown as StreamWriter,
                 {
+                  userMessageId: message.id,
                   phase: "processing",
                   providerType: currentModelConfig?.providerId ? resolvedProviderType || providerType : providerType,
                   modelName: currentModelConfig?.displayName || actualModelId,
@@ -11476,6 +11375,7 @@ export async function POST(request: Request) {
                     setImageFallbackModelCooldown(candidate.model.id, fallbackErrorMessage);
                   }
                   chatApiLogger.error(`[Chat API] ❌ OpenAI-compatible fallback model ${candidate.model.displayName} (${candidate.provider.type}) failed:`, fallbackError);
+                  if (!shouldFailoverAiModelError(fallbackError)) throw fallbackError;
                 }
               }
 
@@ -11647,6 +11547,7 @@ export async function POST(request: Request) {
               writeImageGenerationStatusChunk(
                 dataStream as unknown as StreamWriter,
                 {
+                  userMessageId: message.id,
                   phase: "completed",
                   providerType: resolvedProviderType || providerType,
                   modelName: usedModelDisplayName,
@@ -11706,54 +11607,10 @@ export async function POST(request: Request) {
           } catch (error) {
             chatApiLogger.error("[Chat API] OpenAI-compatible image model generation error:", error);
 
-            const errorMessageId = generateUUID();
+            await reportImageGenerationFailure({
-            const errorText = getPublicImageGenerationErrorText(error, errorMessageId);
+              writer: dataStream as unknown as StreamWriter,
-
+              chatId: id, userMessageId: message.id,
-            dataStream.write({
+              messageId: generateUUID(), error, label: "openai-compat:error",
-              type: "data-appendMessage",
-              data: JSON.stringify({
-                id: errorMessageId,
-                role: "assistant",
-                parts: [{ type: "text", text: errorText }],
-              }),
-            });
-	            dataStream.write({
-	              type: "data-appendMessage",
-	              data: JSON.stringify({
-	                id: generateUUID(),
-	                role: "assistant",
-	                parts: [{ type: "text", text: "<!-- IMAGE_GENERATION_END -->" }],
-	              }),
-	            });
-            if (contextPayload?.source === "canvas") {
-              writeImageGenerationStatusChunk(
-                dataStream as unknown as StreamWriter,
-                {
-                  phase: "failed",
-                  providerType: resolvedProviderType || providerType,
-                  modelName: currentModelConfig?.displayName || actualModelId,
-                  imageCount: effectiveImageParams?.imageCount || 1,
-                },
-                "openai-compat:image-status-failed",
-              );
-            }
-
-            await saveMessages({
-              messages: [
-                {
-                  id: errorMessageId,
-                  role: "assistant",
-                  parts: [{ type: "text", text: errorText }],
-                  createdAt: new Date(),
-                  attachments: [],
-                  chatId: id,
-                  videoStorageStatus: null,
-                  temporaryVideoUrl: null,
-                  permanentVideoUrl: null,
-                  archivedAt: null,
-                  videoMetadata: null,
-                },
-              ],
             });
             return;
           }

app/(chat)/api/models/route.ts

@@ -10,6 +10,10 @@ import {
 } from "@/lib/db/queries";
 import { getAiModelFrontendAvailability } from "@/lib/ai/model-frontend-availability";
 import { buildVideoToolCapability } from "@/lib/ai/video-tool-capability";
+import {
+  DETAIL_REPLACEMENT_IMAGE_MODEL_CONFIG_KEY,
+  findConfiguredDetailReplacementImageModel,
+} from "@/lib/ai/detail-replacement-image-model-config";
 import {
   isImageGenerationModelDescriptor,
   isVideoModelDescriptor,
@@ -157,10 +161,17 @@ export async function GET(request: Request) {
       : await getEnabledAiModelsWithProvider(false, true);
     const agentModelWithProvider = await getAgentAiModelWithProvider();
     const defaultModel = await getDefaultAiModel();
-    const [siteSettings, agentWorkflowUiConfigSetting] = await Promise.all([
+    const [siteSettings, agentWorkflowUiConfigSetting, detailReplacementModelSetting] = await Promise.all([
       getSiteSettings(),
       getSystemSetting({ key: AGENT_WORKFLOW_UI_CONFIG_KEY }).catch(() => null),
+      getSystemSetting({ key: DETAIL_REPLACEMENT_IMAGE_MODEL_CONFIG_KEY }).catch(() => null),
     ]);
+    const detailReplacementModel = findConfiguredDetailReplacementImageModel(
+      includeUnavailable ? modelsWithProvider.filter(({ model, provider }) =>
+        provider.isEnabled && model.isEnabled && getAiModelFrontendAvailability(model).selectable !== false
+      ) : modelsWithProvider,
+      detailReplacementModelSetting?.value,
+    );
     type ModelWithProvider = (typeof modelsWithProvider)[number];
     const serializeModel = ({ model, provider }: ModelWithProvider) => ({
       id: model.id,
@@ -309,6 +320,7 @@ export async function GET(request: Request) {
         : null,
       agentWorkflowDefaultModelId: agentWorkflowDefaultModel?.model.id || null,
       agentWorkflowConfiguredModels,
+      detailReplacementModel: detailReplacementModel ? serializeModel(detailReplacementModel) : null,
       agentModel: agentModelWithProvider
         ? {
             id: agentModelWithProvider.model.id,

app/(chat)/featured/page.tsx

@@ -8,6 +8,8 @@ import { ArrowLeft, Download, ChevronLeft, ChevronRight, ChevronsLeft, ChevronsR
 import { Input } from "@/components/ui/input";
 import Image from "next/image";
 import { formatBeijingTime } from "@/lib/utils";
+import { toast } from "sonner";
+import { downloadOriginalImage, getCanvasImageDownloadErrorMessage } from "@/lib/client/canvas-image-download";
 
 type FeaturedImage = {
   id: string;
@@ -74,18 +76,11 @@ export default function FeaturedPage() {
 
   const handleDownload = async (url: string, prompt: string) => {
     try {
-      const response = await fetch(url);
+      await downloadOriginalImage({ url, name: "featured-image" });
-      const blob = await response.blob();
+      toast.success("原图已开始下载");
-      const blobUrl = window.URL.createObjectURL(blob);
-      const link = document.createElement("a");
-      link.href = blobUrl;
-      link.download = `featured-${Date.now()}.png`;
-      document.body.appendChild(link);
-      link.click();
-      document.body.removeChild(link);
-      window.URL.revokeObjectURL(blobUrl);
     } catch (error) {
       console.error("Download failed:", error);
+      toast.error(getCanvasImageDownloadErrorMessage(error));
     }
   };
 

app/(chat)/gallery/page.tsx

@@ -13,6 +13,7 @@ import { requestLongTaskResult } from "@/lib/client/long-task";
 import { buildImageProxyUrl, getImageDownloadExtension } from "@/lib/image-delivery";
 import { inferOriginalImageUrl } from "@/lib/image-url";
 import { formatBeijingTime } from "@/lib/utils";
+import { downloadOriginalImage, getCanvasImageDownloadErrorMessage } from "@/lib/client/canvas-image-download";
 
 type GalleryImage = {
   id: string;
@@ -59,7 +60,7 @@ function buildGalleryDownloadFilename(url: string, alt: string, contentType: str
     }
   }
 
-  return `${safeBase}-${Date.now()}.${getImageDownloadExtension(contentType) || extension}`;
+  return `${safeBase}.${getImageDownloadExtension(contentType) || extension}`;
 }
 
 export default function GalleryPage() {
@@ -119,25 +120,11 @@ export default function GalleryPage() {
       const parsed = new URL(originalUrl, window.location.origin);
       const source = parsed.pathname === "/api/image-proxy" ? originalUrl : inferOriginalImageUrl(originalUrl);
 
-      const response = await fetch(
+      await downloadOriginalImage({ url: source, name: buildGalleryDownloadFilename(originalUrl, alt, "") });
-        buildImageProxyUrl(source, { delivery: "original" })
-      );
-      if (!response.ok) {
-        throw new Error(`download failed: ${response.status}`);
-      }
-      const blob = await response.blob();
-      const blobUrl = window.URL.createObjectURL(blob);
-      const link = document.createElement("a");
-      link.href = blobUrl;
-      link.download = buildGalleryDownloadFilename(originalUrl, alt, blob.type);
-      document.body.appendChild(link);
-      link.click();
-      document.body.removeChild(link);
-      window.setTimeout(() => window.URL.revokeObjectURL(blobUrl), 1000);
       toast.success("图片已开始下载");
     } catch (error) {
       console.error("Download failed:", error);
-      toast.error(error instanceof Error && error.message.includes("无法确认原图") ? error.message : "原图下载失败，请重试");
+      toast.error(getCanvasImageDownloadErrorMessage(error));
     }
   };
 

app/api/agent-workflow/template-prompts/route.ts

@@ -0,0 +1,20 @@
+import { z } from "zod";
+import { auth } from "@/app/(auth)/auth";
+import { resolveAgentWorkflowComposerSelections } from "@/lib/agents/workflow-composer";
+import { AGENT_WORKFLOW_UI_CONFIG_KEY, normalizeAgentWorkflowUiConfig } from "@/lib/agents/workflow-ui-config";
+import { getSystemSetting } from "@/lib/db/queries";
+
+const selectionsSchema = z.record(z.string().max(160), z.string().max(8192))
+  .refine((selections) => Object.keys(selections).length <= 100);
+
+export async function POST(request: Request) {
+  const session = await auth();
+  if (!session?.user?.id) return Response.json({ error: "请先登录" }, { status: 401 });
+
+  const selections = selectionsSchema.safeParse(await request.json().catch(() => null));
+  if (!selections.success) return Response.json({ error: "风格模板选择无效" }, { status: 400 });
+
+  const setting = await getSystemSetting({ key: AGENT_WORKFLOW_UI_CONFIG_KEY });
+  const config = normalizeAgentWorkflowUiConfig(setting?.value);
+  return Response.json({ selections: resolveAgentWorkflowComposerSelections({ config, selections: selections.data }) });
+}

app/api/agents/detail-replacement/batches/route.ts

@@ -4,6 +4,7 @@ import { auth } from "@/app/(auth)/auth";
 import { db } from "@/lib/db";
 import { canvasImageTask, canvasProject, message } from "@/lib/db/schema";
 import { extractAgentProjectStateFromCanvasData, isAgentProjectRow } from "@/lib/agents/agent-project-compat";
+import { MAX_DETAIL_REPLACEMENT_REFERENCES } from "@/lib/agents/mode-workspace-state";
 import {
   createCanvasImageTask,
   enqueueCanvasImageTask,
@@ -146,6 +147,14 @@ export async function POST(request: Request) {
         .map((item) => [String(item.id), String(item.imageUrl)]),
     );
     const requested = Array.isArray(body.references) ? body.references : [];
+    if (requested.length === 0) {
+      return NextResponse.json({ error: "请先选择详情参考图" }, { status: 400 });
+    }
+    if (requested.length > MAX_DETAIL_REPLACEMENT_REFERENCES) {
+      return NextResponse.json({
+        error: `本次选中了 ${requested.length} 张详情参考图，一次最多替换 ${MAX_DETAIL_REPLACEMENT_REFERENCES} 张，请减少本次选择后重试`,
+      }, { status: 400 });
+    }
     const references: DetailReplacementBatchReference[] = requested.map((raw: unknown) => {
       const item = raw && typeof raw === "object" ? raw as Record<string, unknown> : {};
       return {
@@ -160,7 +169,6 @@ export async function POST(request: Request) {
       };
     });
     if (
-      references.length === 0 || references.length > 40 ||
       new Set(references.map((item) => item.id)).size !== references.length ||
       references.some((item) => !item.id || knownReferences.get(item.id) !== item.imageUrl)
     ) {
@@ -187,6 +195,12 @@ export async function POST(request: Request) {
     if (!model || model === "auto" || !models.some((entry) => entry.model.id === model)) {
       return NextResponse.json({ error: "详情替换模型不可用，请检查模型配置" }, { status: 400 });
     }
+    if (typeof body.expectedModelId === "string" && body.expectedModelId !== model) {
+      return NextResponse.json({
+        code: "DETAIL_REPLACEMENT_MODEL_CHANGED",
+        error: "详情替换模型已更新，请确认页面显示的模型后重新提交",
+      }, { status: 409 });
+    }
     const quota = await checkUserImageQuota(session.user.id);
     if (!quota.allowed) {
       return NextResponse.json({ error: "本月图片生成配额已用完" }, { status: 429 });

app/api/app-version/route.ts

@@ -0,0 +1,8 @@
+import { NextResponse } from "next/server";
+
+export const dynamic = "force-dynamic";
+export function GET() {
+  return NextResponse.json({ version: process.env.NEXT_PUBLIC_APP_RELEASE || "development" }, {
+    headers: { "Cache-Control": "no-store, max-age=0" },
+  });
+}

app/api/canvas/3d/model-proxy/route.ts

@@ -1,5 +1,5 @@
 import { NextResponse } from "next/server";
-import { isRetiredStorageUrl, RETIRED_STORAGE_MESSAGE } from "@/lib/storage/retired-storage";
+import { isRetiredStorageUrl, normalizeLegacyAliyunStorageUrl, RETIRED_STORAGE_MESSAGE } from "@/lib/storage/retired-storage";
 import { auth } from "@/app/(auth)/auth";
 import { buildThreeAssetUrl } from "@/lib/canvas/three-asset-url";
 
@@ -182,6 +182,18 @@ async function handleRequest(request: Request, method: "GET" | "HEAD") {
       return NextResponse.json({ success: false, error: "仅支持 http/https 模型地址" }, { status: 400 });
     }
 
+    if (normalizeLegacyAliyunStorageUrl(targetUrl.toString())) {
+      try {
+        const { resolveLegacyAliyunStorageUrl } = await import("@/lib/storage/image-archive-db");
+        targetUrl = new URL(await resolveLegacyAliyunStorageUrl(targetUrl.toString()));
+      } catch (error) {
+        if (error instanceof Error && error.message.includes("HTTP 410")) {
+          return NextResponse.json({ success: false, error: RETIRED_STORAGE_MESSAGE, code: "storage_retired" }, { status: 410 });
+        }
+        throw error;
+      }
+    }
+
     if (!isAllowedModelHost(targetUrl.hostname)) {
       return NextResponse.json({ success: false, error: "不允许的模型地址域名" }, { status: 403 });
     }

app/api/canvas/[id]/capabilities/route.ts

@@ -2,6 +2,7 @@ import { NextResponse } from "next/server";
 import { ZodError } from "zod";
 
 import { auth } from "@/app/(auth)/auth";
+import { RmbgServiceError } from "@/lib/ai/rmbg/service";
 import { canvasCapabilityClientCommandSchema } from "@/lib/canvas/capabilities/client-command";
 import { CanvasCapabilityRuntimeError } from "@/lib/canvas/capabilities/context";
 import { getCanvasCapabilityManifest } from "@/lib/canvas/capabilities/registry";
@@ -90,7 +91,7 @@ export async function POST(
     const failure = getRequestFailureDetails(error, "执行画布能力失败");
     return NextResponse.json(
       { success: false, error: formatRequestFailure(failure, requestId), failure, requestId },
-      { status: 500 }
+      { status: error instanceof RmbgServiceError ? error.status : 500 }
     );
   }
 }

app/api/canvas/agent-chat/route.ts

@@ -329,6 +329,7 @@ export async function POST(request: Request) {
                 withModel,
                 imageSize: snapshot.imagePreferences?.parameters?.imageSize,
                 imagePreferences: snapshot.imagePreferences,
+                priorCalls: snapshot.calls,
                 preferredModelId: snapshot.imagePreferences?.modelId || (preset?.type === "image" ? preset.defaultModelId || undefined : undefined),
                 operationSelectedNodeIds: selectedNodeIds,
                 objective: [snapshot.objective, ...snapshot.inputs.map((input) => input.text)].join(

app/api/canvas/box-cutout/route.ts

@@ -1,100 +1,15 @@
-import { NextRequest, NextResponse } from "next/server";
+import { NextResponse } from "next/server";
 
 import { auth } from "@/app/(auth)/auth";
-import {
+import { executeBoxCutoutPOST } from "@/lib/canvas/operations/box-cutout";
-  BoxCutoutServiceError,
-  executeBoxCutoutJob,
-} from "@/lib/ai/box-cutout/service";
-import { RmbgServiceError } from "@/lib/ai/rmbg/service";
-import { getPointsSystemConfig } from "@/lib/db/queries";
-import { prepareFeaturePointsCharge } from "@/lib/points/feature-charge";
-import { getImageToolCreditCost } from "@/lib/points/config";
 
 export const runtime = "nodejs";
 export const maxDuration = 60;
 
-type BoxCutoutRequest = {
+export async function POST(request: Request) {
-  imageUrl?: string;
-  cropRect?: {
-    x?: number;
-    y?: number;
-    width?: number;
-    height?: number;
-  };
-  paddingRatio?: number;
-  prompt?: string;
-  chatId?: string | null;
-  messageId?: string | null;
-  skipGallerySave?: boolean;
-  sourceNodeId?: string;
-};
-
-export async function POST(request: NextRequest) {
-  try {
   const session = await auth();
   if (!session?.user?.id) {
     return NextResponse.json({ success: false, error: "未授权，请先登录" }, { status: 401 });
   }
-
+  return executeBoxCutoutPOST(request, session.user.id);
-    const body = (await request.json()) as BoxCutoutRequest;
-    const rawImageUrl = String(body.imageUrl || "").trim();
-    if (!rawImageUrl) {
-      return NextResponse.json({ success: false, error: "缺少 imageUrl 参数" }, { status: 400 });
-    }
-
-    const resolvedImageUrl = new URL(rawImageUrl, request.url).toString();
-    const pointsConfig = await getPointsSystemConfig();
-    const pointsCharge = await prepareFeaturePointsCharge({
-      userId: session.user.id,
-      unitCost: getImageToolCreditCost(pointsConfig, "box-cutout"),
-      reason: "image_box_cutout",
-      modelId: "box-cutout",
-      note: "框选抠图消耗积分",
-      pointsConfig,
-    });
-    if (!pointsCharge.ok) {
-      return NextResponse.json(pointsCharge.payload, { status: pointsCharge.status });
-    }
-
-    const result = await executeBoxCutoutJob({
-      userId: session.user.id,
-      imageUrl: resolvedImageUrl,
-      cropRect: body.cropRect || {},
-      paddingRatio: body.paddingRatio,
-      prompt: body.prompt || "框选抠图",
-      chatId: body.chatId || null,
-      messageId: body.messageId || null,
-      skipGallerySave: body.skipGallerySave === true,
-      sourceNodeId: body.sourceNodeId,
-    });
-
-    if (pointsCharge.chargeable) {
-      try {
-        await pointsCharge.consume();
-      } catch (pointsError) {
-        console.error("[Points] Failed to consume box cutout points:", pointsError);
-      }
-    }
-
-    return NextResponse.json(result);
-  } catch (error) {
-    if (error instanceof BoxCutoutServiceError || error instanceof RmbgServiceError) {
-      return NextResponse.json(
-        {
-          success: false,
-          error: error.detail || error.message,
-        },
-        { status: error.status },
-      );
-    }
-
-    console.error("[BoxCutout] 处理失败:", error);
-    return NextResponse.json(
-      {
-        success: false,
-        error: error instanceof Error ? error.message : "框选抠图失败",
-      },
-      { status: 500 },
-    );
-  }
 }

app/api/canvas/download-image/route.ts

@@ -1,6 +1,9 @@
 import { resolveCanvasCdnDownload } from "@/lib/storage/canvas-cdn-download";
 import { isRetiredStorageUrl, RETIRED_STORAGE_MESSAGE } from "@/lib/storage/retired-storage";
-import { prepareImageArchiveDownload } from "@/lib/storage/image-download-preparation";
+import { scheduleImageDownloadPreparation } from "@/lib/storage/image-download-preparation";
+import { randomUUID } from "node:crypto";
+import { formatDownloadFailure, getDownloadFailure, type DownloadFailure } from "@/lib/canvas/download-error";
+import { createLogger } from "@/lib/observability/logger";
 import { after, NextRequest, NextResponse } from "next/server";
 import { auth } from "@/app/(auth)/auth";
 import { getDownloadPreparationQueue, type DownloadPreparationInput } from "@/lib/canvas/download-preparation";
@@ -13,6 +16,22 @@ import {
 
 export const runtime = "nodejs";
 export const maxDuration = 120;
+const logger = createLogger("canvas.download");
+
+function failed(failure: DownloadFailure, requestId: string) {
+  logger.warn("request_failed", { requestId, code: failure.code, status: failure.status });
+  return NextResponse.json({ success: false, error: formatDownloadFailure(failure, requestId), failure, requestId }, {
+    status: failure.status,
+    headers: { "Cache-Control": "no-store", ...(failure.status === 429 ? { "Retry-After": "3" } : {}) },
+  });
+}
+
+function preparing(requestId: string) {
+  return NextResponse.json({ delivery: "preparing", retryAfter: 2, requestId,
+    message: "正在准备原图，完成后将自动开始下载" }, {
+    status: 202, headers: { "Retry-After": "2", "Cache-Control": "no-store" },
+  });
+}
 
 async function prepareDownload(input: DownloadPreparationInput, signal: AbortSignal) {
   // A proxy candidate for the same original must not repeat the same slow
@@ -21,22 +40,25 @@ async function prepareDownload(input: DownloadPreparationInput, signal: AbortSig
     const source = extractImageProxySourceUrl(url) || url;
     return inferOriginalImageUrl(source) || source;
   }))];
-  for (let attempt = 0; attempt < 3; attempt++) {
+  let lastError: unknown;
+  for (let attempt = 0; attempt < 2; attempt++) {
     signal.throwIfAborted();
     for (const url of sources) {
       signal.throwIfAborted();
       const result = await fetchCanvasDownloadAsset({
         file: { url, name: "original" }, index: 0,
         requestOrigin: input.requestOrigin, cookie: input.cookie,
-        includeSequencePrefix: false, timeoutMs: 12_000, retryCount: 1, signal,
+        includeSequencePrefix: false, timeoutMs: 60_000, retryCount: 1, signal,
       });
       if (result.ok) return { buffer: result.bytes, contentType: result.contentType };
+      lastError = result.error;
     }
     // Each pass resolves the latest archive URL inside fetchCanvasDownloadAsset.
     // No AI/model request is involved and a completed source fetch is shared.
-    if (attempt < 2) await new Promise(resolve => setTimeout(resolve, 1_000));
+    if (attempt < 1 && getDownloadFailure(lastError).retryable) await new Promise(resolve => setTimeout(resolve, 1_000));
+    else break;
   }
-  throw new Error("Original image sources unavailable");
+  throw new Error(String(lastError || "Original image sources unavailable"));
 }
 
 function getRequestOrigin(request: NextRequest): string {
@@ -76,31 +98,43 @@ function resolveDownloadUrls(body: Record<string, unknown>, origin: string): str
 }
 
 export async function POST(request: NextRequest) {
+  const requestId = randomUUID();
   try {
     const session = await auth();
     if (!session?.user?.id) {
-      return NextResponse.json({ success: false, error: "未登录" }, { status: 401 });
+      return failed(getDownloadFailure("未登录"), requestId);
     }
 
     const body = (await request.json().catch(() => ({}))) as Record<string, unknown>;
     const requestOrigin = getRequestOrigin(request);
     const candidates = resolveDownloadUrls(body, requestOrigin);
     if (candidates.length && candidates.every(isRetiredStorageUrl)) {
-      return NextResponse.json({ success: false, error: RETIRED_STORAGE_MESSAGE, code: "storage_retired" }, { status: 410 });
+      return failed(getDownloadFailure(RETIRED_STORAGE_MESSAGE), requestId);
     }
     const urls = candidates.filter(url => !isRetiredStorageUrl(url));
     const requestedUrls = [...urls];
     if (urls.length === 0) {
-      return NextResponse.json({ success: false, error: "图片地址无效" }, { status: 400 });
+      return failed(getDownloadFailure("图片地址无效"), requestId);
     }
 
     const name = sanitizeCanvasDownloadFileName(String(body.name || ""), "canvas-image");
     if (body.preferDirect === true) {
-      const { task, direct } = await resolveCanvasCdnDownload(urls, `${name}.png`).catch(() => ({ task: null, direct: null }));
+      const { task, direct, canPrepareDirect } = await resolveCanvasCdnDownload(urls, `${name}.png`).catch((error) => {
+        logger.warn("cdn_lookup_failed", error, { requestId });
+        return { task: null, direct: null, canPrepareDirect: false };
+      });
       if (direct) return NextResponse.json(direct, { headers: { "Cache-Control": "no-store" } });
+      if (task && canPrepareDirect && body.preparation === "async") {
+        const asset = (task.metadata as { downloadAsset?: { status?: string; failure?: DownloadFailure; retryAt?: string } } | null)?.downloadAsset;
+        if (asset?.status === "abandoned" || (asset?.status === "failed" && Date.parse(asset.retryAt || "") > Date.now())) {
+          return failed(asset.failure || getDownloadFailure(null), task.id);
+        }
+        scheduleImageDownloadPreparation(task.id);
+        return preparing(task.id);
+      }
       if (task?.targetUrl) {
         if (!urls.includes(task.targetUrl)) urls.unshift(task.targetUrl);
-        after(() => prepareImageArchiveDownload(task.id));
+        scheduleImageDownloadPreparation(task.id);
       }
     }
     const cookie = request.headers.get("cookie") || "";
@@ -109,13 +143,10 @@ export async function POST(request: NextRequest) {
         userId: session.user.id, urls: requestedUrls, requestOrigin, cookie,
       });
       if (result.status === "preparing") {
-        return NextResponse.json({ delivery: "preparing", retryAfter: 3,
+        return preparing(result.requestId);
-          message: "正在准备原图，完成后将自动下载" }, {
-          status: 202, headers: { "Retry-After": "3", "Cache-Control": "no-store" },
-        });
       }
       if (result.status === "failed") {
-        return NextResponse.json({ success: false, error: result.error }, { status: 502 });
+        return failed(result.failure, result.requestId);
       }
       return new NextResponse(new Uint8Array(result.asset.buffer), { headers: {
         "Content-Type": result.asset.contentType,
@@ -136,17 +167,14 @@ export async function POST(request: NextRequest) {
         includeSequencePrefix: false,
       });
       if (result.ok) break;
-      failures.push(`${url}: ${result.error}`);
+      failures.push(result.error);
     }
 
     if (!result?.ok) {
       if (failures.length > 0) {
-        console.warn("[CanvasDownloadImage] All candidates failed:", failures);
+        logger.warn("all_sources_failed", { requestId, failures });
       }
-      return NextResponse.json(
+      return failed(getDownloadFailure(result?.error), requestId);
-        { success: false, error: result?.error || "图片源文件暂时不可访问" },
-        { status: 502 }
-      );
     }
 
     return new NextResponse(result.bytes, {
@@ -159,7 +187,7 @@ export async function POST(request: NextRequest) {
       },
     });
   } catch (error) {
-    console.error("[CanvasDownloadImage] Failed:", error);
+    logger.error("download_failed", error, { requestId });
-    return NextResponse.json({ success: false, error: "图片下载失败" }, { status: 500 });
+    return failed(getDownloadFailure(error), requestId);
   }
 }

app/api/canvas/download-zip-task/route.ts

@@ -10,11 +10,13 @@ import JSZip from "jszip";
 import { auth } from "@/app/(auth)/auth";
 import { fetchCanvasDownloadAsset } from "@/lib/canvas/photoshop-safe-download";
 import { publishCanvasZip } from "@/lib/storage/canvas-zip-delivery";
+import { trackRuntimeWork } from "@/lib/observability/active-work";
 export const runtime = "nodejs";
 export const maxDuration = 300;
 type DownloadFileItem = { url: string; name?: string };
 const MAX_DOWNLOAD_FILES = 200;
-const TASK_TTL_MS = 60 * 60_000;
+const TASK_TTL_MS = 24 * 60 * 60_000;
+const PREPARATION_TTL_MS = 6 * 60 * 60_000;
 const running = (globalThis as typeof globalThis & { __canvasZipRunning?: Set<string> });
 const active = running.__canvasZipRunning ??= new Set<string>();
 function sanitizeFolderName(value: string): string {
@@ -98,8 +100,12 @@ async function processTask(id: string, userId: string, requestOrigin: string, co
     task = await loadZipTask(id, userId);
     if (!task || task.status === "completed" || task.status === "failed") return;
     await assertZipDiskSpace();
-    task.status = "running"; task.stage = "正在准备原图"; task.updatedAt = Date.now();
+    const existingZip = task.zipFile && task.contentDisposition && await stat(task.zipFile.path).catch(() => null);
+    const reuseZip = existingZip && existingZip.size === task.zipFile!.bytes;
+    task.status = "running"; task.stage = reuseZip ? "正在准备加速下载" : "正在准备原图"; task.updatedAt = Date.now();
     await saveZipTask(task);
+    if (!reuseZip) {
+      delete task.zipFile; delete task.contentDisposition; delete task.cdnUrl;
       // Stage each image on disk, not all PNG buffers in the web process heap.
       // A restart resumes from these files using the current owner's session.
       let cursor = 0;
@@ -137,24 +143,28 @@ async function processTask(id: string, userId: string, requestOrigin: string, co
       task.stage = "正在生成完整 ZIP 文件"; await saveZipTask(task);
       task.zipFile = await writeDownloadZip(zip, task.id, percent => { task!.compressPercent = percent; });
       task.contentDisposition = buildContentDisposition(task.folderName);
+    }
     task.stage = "正在准备下载链接"; await saveZipTask(task);
-    try {
+    const cdn = await publishCanvasZip({ id: task.id, ...task.zipFile!, disposition: task.contentDisposition!,
-      const cdn = await publishCanvasZip({ id: task.id, ...task.zipFile, disposition: task.contentDisposition });
+      onProgress: async bytes => {
+        task!.stage = `正在传送至七牛 ${Math.round(bytes / task!.zipFile!.bytes * 100)}%`;
+        task!.updatedAt = Date.now(); await saveZipTask(task!);
+      } });
     if (cdn) {
       task.cdnObject = { storageConfigId: cdn.storageConfigId, key: cdn.key };
-        if (cdn.url) task.cdnUrl = cdn.url;
+      if (!cdn.url) throw new Error(cdn.error || `ZIP 已打包，但加速下载未就绪，请再次点击下载继续传送原 ZIP。下载编号：${task.id}`);
+      task.cdnUrl = cdn.url;
     }
-    } catch { console.warn("[CanvasDownloadZipTask] CDN delivery unavailable; complete local ZIP retained", { taskId: id }); }
     task.status = "completed"; task.stage = task.failedCount ? `已打包 ${task.successCount} 张，${task.failedCount} 张未能读取` : "打包完成";
     task.compressPercent = 100; task.updatedAt = Date.now(); task.expiresAt = Date.now() + TASK_TTL_MS;
     await saveZipTask(task);
     // The complete ZIP is enough for retries; release staged duplicate bytes.
     await Promise.all(task.files.filter(f => f.prepared).map(f => rm(join(zipTaskPath(id), f.prepared!), { force: true }).catch(() => undefined)));
     console.info("[CanvasDownloadZipTask] Complete", { taskId: id, count: task.successCount, failed: task.failedCount,
-      bytes: task.zipFile.bytes, delivery: task.cdnUrl ? "cdn" : "local" });
+      bytes: task.zipFile!.bytes, delivery: task.cdnUrl ? "cdn" : "local" });
   } catch (error) {
     if (task) {
-      task.status = "failed"; task.stage = "打包未完成";
+      task.status = "failed"; task.stage = task.zipFile ? "ZIP 已打包，加速下载未就绪" : "打包未完成";
       task.error = error instanceof Error ? error.message : "打包失败，请稍后重试";
       task.updatedAt = Date.now(); task.expiresAt = Date.now() + TASK_TTL_MS; await saveZipTask(task).catch(() => undefined);
     }
@@ -162,7 +172,7 @@ async function processTask(id: string, userId: string, requestOrigin: string, co
   } finally { await release?.().catch(() => undefined); active.delete(id); }
 }
 function schedule(task: ZipTask, request: NextRequest) {
-  const run = () => processTask(task.id, task.userId, getRequestOrigin(request), request.headers.get("cookie") || "");
+  const run = () => trackRuntimeWork(() => processTask(task.id, task.userId, getRequestOrigin(request), request.headers.get("cookie") || ""));
   after(run);
 }
 export async function POST(request: NextRequest) {
@@ -187,14 +197,17 @@ export async function POST(request: NextRequest) {
       const now = Date.now();
       task = { id, userId: session.user.id, folderName: sanitizeFolderName(String(body.folderName || "")), files,
         totalCount: files.length, processedCount: 0, successCount: 0, failedCount: 0, compressPercent: 0,
-        status: "pending", stage: "等待后台准备", createdAt: now, updatedAt: now, expiresAt: now + 6 * TASK_TTL_MS };
+        status: "pending", stage: "等待后台准备", createdAt: now, updatedAt: now, expiresAt: now + PREPARATION_TTL_MS };
       await saveZipTask(task);
-    } else if (task.status === "failed" && body.retry === true) {
+    } else if ((task.status === "failed" || task.status === "completed" && task.cdnObject && !task.cdnUrl) && body.retry === true) {
       task.status = "pending"; task.error = undefined;
       await assertZipTaskCapacity(session.user.id);
+      if (!task.zipFile) {
         for (const file of task.files) delete file.error;
         task.processedCount = task.successCount = task.files.filter(file => file.prepared).length;
-      task.failedCount = 0; task.updatedAt = Date.now(); task.expiresAt = Date.now() + 6 * TASK_TTL_MS;
+        task.failedCount = 0;
+      }
+      task.updatedAt = Date.now(); task.expiresAt = Date.now() + PREPARATION_TTL_MS;
       await saveZipTask(task);
     }
     if (task.status === "pending" || task.status === "running") schedule(task, request);

app/api/canvas/text-detect/route.ts

@@ -1,7 +1,11 @@
 import { NextResponse } from "next/server";
 import { z } from "zod";
+import { and, eq, inArray } from "drizzle-orm";
 import { auth } from "@/app/(auth)/auth";
 import { callQwen3Vl } from "@/lib/ai/qwen3-vl";
+import { executeConfiguredVip98kTask, getVip98kRuntimeProviders } from "@/lib/ai/vip98k-runtime";
+import { db } from "@/lib/db";
+import { aiModel } from "@/lib/db/schema";
 import { createLogger } from "@/lib/observability/logger";
 import sharp from "sharp";
 
@@ -90,6 +94,39 @@ function fallbackItemsFromRaw(raw: string): OcrItem[] {
   }));
 }
 
+async function detectTextWithVip98k(imageUrl: string): Promise<OcrItem[] | null> {
+  const providers = await getVip98kRuntimeProviders();
+  if (!providers.length) return null;
+
+  const model = await db.query.aiModel.findFirst({
+    columns: { providerId: true },
+    where: and(
+      inArray(aiModel.providerId, providers.map(({ id }) => id)),
+      eq(aiModel.modelId, "ocr"),
+      eq(aiModel.isEnabled, true),
+    ),
+  });
+  if (!model) return null;
+
+  const result = await executeConfiguredVip98kTask({
+    modelId: "ocr",
+    kind: "image-tool",
+    imageUrls: [imageUrl],
+    preferredProviderId: model.providerId,
+  });
+  const textUrl = result.outputUrls[0];
+  if (!textUrl) throw new Error("98K 文字识别未返回文本文件");
+
+  const response = await fetch(textUrl, { signal: AbortSignal.timeout(15_000) });
+  const type = response.headers.get("content-type") || "";
+  if (!response.ok || !/^(?:text\/plain|application\/octet-stream)(?:;|$)/i.test(type)) {
+    await response.body?.cancel();
+    throw new Error(`无法读取 98K 文字识别结果（HTTP ${response.status}）`);
+  }
+  return (await response.text()).split(/\r\n?|\n/).map((line) => line.trim())
+    .filter(Boolean).slice(0, 50).map((text, index) => ({ id: String(index + 1), text }));
+}
+
 function shouldUseDataUrlFallback(error: unknown) {
   const message =
     error instanceof Error ? error.message.toLowerCase() : String(error || "").toLowerCase();
@@ -147,6 +184,11 @@ export async function POST(request: Request) {
       return NextResponse.json({ success: false, error: "仅支持 URL 图片，不允许 base64 传输" }, { status: 400 });
     }
 
+    const detected = await detectTextWithVip98k(imageUrl);
+    if (detected !== null) {
+      return NextResponse.json({ success: true, data: { items: detected, model: "ocr" } });
+    }
+
     logger.debug("model_selected", { model: "qwen3-vl" });
     const prompt = [
       "你是图片文字识别助手。",
@@ -191,15 +233,9 @@ export async function POST(request: Request) {
     }
 
     const parsedJson = parseJsonText(text || "");
-    let items: OcrItem[] = [];
+    const items = Array.isArray(parsedJson?.items)
-
+      ? sanitizeItems(parsedJson.items)
-    if (parsedJson && Array.isArray(parsedJson.items)) {
+      : fallbackItemsFromRaw(text);
-      items = sanitizeItems(parsedJson.items);
-    }
-
-    if (items.length === 0 && text) {
-      items = fallbackItemsFromRaw(text);
-    }
 
     return NextResponse.json({
       success: true,
@@ -213,7 +249,7 @@ export async function POST(request: Request) {
     return NextResponse.json(
       {
         success: false,
-        error: error instanceof Error ? error.message : "文字识别失败",
+        error: "图片文字识别暂不可用，请稍后重试",
       },
       { status: 500 },
     );

app/api/image-proxy/route.ts

@@ -1,8 +1,12 @@
 import crypto from "node:crypto";
-import { isRetiredStorageUrl, RETIRED_STORAGE_MESSAGE } from "@/lib/storage/retired-storage";
+import { isRetiredStorageUrl, normalizeLegacyAliyunStorageUrl, RETIRED_STORAGE_MESSAGE } from "@/lib/storage/retired-storage";
 import { NextRequest, NextResponse } from "next/server";
+import { formatDownloadFailure, getDownloadFailure } from "@/lib/canvas/download-error";
+import { createLogger } from "@/lib/observability/logger";
+import { buildImageProxyUrl, isAlibabaModelImageUrl } from "@/lib/image-delivery";
 
 export const runtime = "nodejs";
+const logger = createLogger("image.download");
 
 const DEFAULT_QUALITY = 82;
 const MAX_WIDTH = 4096;
@@ -239,6 +243,7 @@ function resolveDirectImageTarget(
   requestedQuality: number | null,
   requestedFormat: string | null
 ): URL | null {
+  if (isAlibabaModelImageUrl(target.toString())) return null;
   if (!isBrowserImageRequest(request)) {
     return null;
   }
@@ -267,8 +272,17 @@ function redirectToDirectImage(target: URL): NextResponse {
 
 export async function GET(request: NextRequest) {
   const { searchParams } = request.nextUrl;
+  const requestId = crypto.randomUUID();
+  const downloadFailure = (error: unknown) => {
+    const failure = getDownloadFailure(error);
+    logger.warn("original_download_failed", error, { requestId, code: failure.code, status: failure.status });
+    return NextResponse.json({ error: formatDownloadFailure(failure, requestId), failure, requestId }, {
+      status: failure.status, headers: { "Cache-Control": "no-store" },
+    });
+  };
   const rawUrl = (searchParams.get("url") || "").trim();
   if (isRetiredStorageUrl(rawUrl)) {
+    if (searchParams.get("original") === "1") return downloadFailure(RETIRED_STORAGE_MESSAGE);
     return NextResponse.json({ error: RETIRED_STORAGE_MESSAGE, code: "storage_retired" }, { status: 410 });
   }
   if (!rawUrl) {
@@ -286,6 +300,24 @@ export async function GET(request: NextRequest) {
     return NextResponse.json({ error: "Only http/https is supported" }, { status: 400 });
   }
 
+  if (normalizeLegacyAliyunStorageUrl(target.toString())) {
+    try {
+      if (searchParams.get("original") === "1") {
+        const { buildImageProxyUrl } = await import("@/lib/image-delivery");
+        buildImageProxyUrl(target.toString(), { delivery: "original" });
+      }
+      const { resolveLegacyAliyunStorageUrl } = await import("@/lib/storage/image-archive-db");
+      target = new URL(await resolveLegacyAliyunStorageUrl(target.toString()));
+    } catch (error) {
+      if (searchParams.get("original") === "1") return downloadFailure(error);
+      const failure = getDownloadFailure(error);
+      return NextResponse.json({ error: formatDownloadFailure(failure, requestId), failure, requestId,
+        code: failure.code === "STORAGE_RETIRED" ? "storage_retired" : failure.code }, {
+        status: failure.status, headers: { "Cache-Control": "no-store" },
+      });
+    }
+  }
+
   if (isBlockedHost(target.hostname)) {
     return NextResponse.json({ error: "Blocked target host" }, { status: 403 });
   }
@@ -306,6 +338,37 @@ export async function GET(request: NextRequest) {
     );
   }
 
+  if (!original && isAlibabaModelImageUrl(target.toString())) {
+    try {
+      const { getArchivedImageUrlMappings } = await import("@/lib/storage/image-archive-db");
+      const mappings = await getArchivedImageUrlMappings([target.toString()]);
+      const archived = mappings[target.toString()];
+      if (archived) {
+        const preview = buildImageProxyUrl(archived, {
+          width: width || undefined,
+          quality,
+          format: ["webp", "avif", "jpeg", "png"].includes(requestedFormat || "") ? requestedFormat as OutputFormat : undefined,
+        });
+        if (/^https?:\/\//i.test(preview)) return redirectToDirectImage(new URL(preview));
+        target = new URL(archived);
+      }
+    } catch (error) {
+      logger.warn("preview_archive_lookup_failed", error, { requestId });
+    }
+  }
+
+  if (original && searchParams.get("download") === "resolve") {
+    try {
+      const { buildImageProxyUrl } = await import("@/lib/image-delivery");
+      buildImageProxyUrl(target.toString(), { delivery: "original" });
+      const { resolveOriginalCdnDownload } = await import("@/lib/storage/original-image-download");
+      const direct = await resolveOriginalCdnDownload(target.toString(), searchParams.get("name") || "", request.signal);
+      return NextResponse.json(direct || { delivery: "proxy" }, { headers: { "Cache-Control": "no-store" } });
+    } catch (error) {
+      return downloadFailure(error);
+    }
+  }
+
   if (!forceProxy && !original) {
     const directImageTarget = resolveDirectImageTarget(
       request,
@@ -346,16 +409,33 @@ export async function GET(request: NextRequest) {
 
   const fetchSignal = AbortSignal.any([
     request.signal,
-    AbortSignal.timeout(width && width <= 256 ? SMALL_PREVIEW_FETCH_TIMEOUT_MS : FETCH_TIMEOUT_MS),
+    AbortSignal.timeout(original ? 60_000 : isAlibabaModelImageUrl(target.toString()) || width && width <= 256 ? SMALL_PREVIEW_FETCH_TIMEOUT_MS : FETCH_TIMEOUT_MS),
   ]);
   const upstreamFailure = (error: unknown) => {
     if (request.signal.aborted) return new NextResponse(null, { status: 499 });
+    if (original) return downloadFailure(error);
     const timedOut = (error instanceof Error && error.name === "TimeoutError") || fetchSignal.reason?.name === "TimeoutError";
     return NextResponse.json(
       { error: timedOut ? "读取源图片超时，请重试" : "源图片传输中断，请重试" },
       { status: timedOut ? 504 : 502 },
     );
   };
+  let contentType: string;
+  let originalBuffer: Buffer;
+  if (!original && isAlibabaModelImageUrl(target.toString())) {
+    try {
+      const { fetchImageBytes } = await import("@/lib/storage/image-byte-cache");
+      const data = await fetchImageBytes(target.toString(), { timeoutMs: SMALL_PREVIEW_FETCH_TIMEOUT_MS });
+      originalBuffer = data.buffer;
+      contentType = data.contentType;
+      if (request.signal.aborted) return new NextResponse(null, { status: 499 });
+      if (!contentType.toLowerCase().startsWith("image/")) {
+        return NextResponse.json({ error: "Upstream is not an image" }, { status: 400 });
+      }
+    } catch (error) {
+      return upstreamFailure(error);
+    }
+  } else {
     let upstreamResponse: Response;
     try {
       upstreamResponse = await fetch(target.toString(), {
@@ -369,23 +449,23 @@ export async function GET(request: NextRequest) {
     }
 
     if (!upstreamResponse.ok) {
+      if (original) return downloadFailure(`HTTP ${upstreamResponse.status}`);
       return NextResponse.json(
         { error: `Upstream responded with ${upstreamResponse.status}` },
         { status: 502 }
       );
     }
-
+    contentType = upstreamResponse.headers.get("content-type") || "application/octet-stream";
-  const contentType = upstreamResponse.headers.get("content-type") || "application/octet-stream";
     if (!contentType.toLowerCase().startsWith("image/")) {
+      if (original) return downloadFailure("Source is not an image");
       return NextResponse.json({ error: "Upstream is not an image" }, { status: 400 });
     }
-
-  let originalBuffer: Buffer;
     try {
       originalBuffer = Buffer.from(await upstreamResponse.arrayBuffer());
     } catch (error) {
       return upstreamFailure(error);
     }
+  }
   if (original) {
     return buildImageResponse(originalBuffer, {
       contentType,

app/api/scene-fusion/route.ts

@@ -6,6 +6,7 @@
  */
 
 import { NextResponse } from "next/server";
+import { preprocessProductImageWithRmbg } from "@/lib/scene-fusion/preprocess-product";
 import { z } from "zod";
 import { auth } from "@/app/(auth)/auth";
 import { db } from "@/lib/db";
@@ -69,7 +70,6 @@ const SCENE_FUSION_REQUEST_STAGGER_MS = 350;
 const SCENE_FUSION_AGENT_TIMEOUT_MS = 20000;
 const SCENE_FUSION_AGENT_MAX_WORKERS = 3;
 const SCENE_FUSION_PROCESS_MAX_WORKERS = 4;
-const SCENE_FUSION_PRE_RMBG_TIMEOUT_MS = 60_000;
 const SCENE_FUSION_ECHO_HASH_TIMEOUT_MS = 20_000;
 const SCENE_FUSION_ECHO_HASH_THRESHOLD = 8;
 const SCENE_FUSION_REVIEW_TIMEOUT_MS = 25_000;
@@ -236,41 +236,6 @@ function isSceneFusionReviewRejectError(message: string): boolean {
   );
 }
 
-function buildPreRmbgCandidateUrls(request: Request): string[] {
-  const urls: string[] = [];
-  const requestUrl = new URL(request.url);
-  const requestHost = requestUrl.hostname.toLowerCase();
-  const requestProtocol = requestUrl.protocol.replace(":", "");
-  if (!(requestProtocol === "https" && (requestHost === "localhost" || requestHost === "127.0.0.1"))) {
-    urls.push(new URL("/api/rmbg", request.url).toString());
-  }
-
-  const host = request.headers.get("host")?.trim();
-  const protoHint = request.headers
-    .get("x-forwarded-proto")
-    ?.split(",")[0]
-    ?.trim()
-    .toLowerCase();
-  const protocol = protoHint === "https" || protoHint === "http" ? protoHint : requestUrl.protocol.replace(":", "");
-
-  if (host) {
-    const normalizedHost = host.split(":")[0]?.toLowerCase() || "";
-    const isLocalHost = normalizedHost === "localhost" || normalizedHost === "127.0.0.1";
-    if (!(protocol === "https" && isLocalHost)) {
-      urls.push(`${protocol}://${host}/api/rmbg`);
-    }
-    if (isLocalHost) {
-      urls.push(`http://${host}/api/rmbg`);
-    }
-  }
-
-  const localPort = requestUrl.port || process.env.PORT || "3125";
-  urls.push(`http://127.0.0.1:${localPort}/api/rmbg`);
-  urls.push(`http://localhost:${localPort}/api/rmbg`);
-
-  return Array.from(new Set(urls));
-}
-
 function normalizeUrlForCompare(input: string): string {
   try {
     const parsed = new URL(input);
@@ -988,102 +953,6 @@ async function getSceneFusionConfig() {
   };
 }
 
-async function preprocessProductImageWithRmbg(
-  request: Request,
-  requestId: string,
-  productImageUrl: string,
-  preRmbgEnabled: boolean
-): Promise<{
-  productImageUrl: string;
-  usedPreRmbg: boolean;
-  provider?: string;
-  reason?: string;
-}> {
-  if (!preRmbgEnabled) {
-    return {
-      productImageUrl,
-      usedPreRmbg: false,
-      reason: "disabled_by_config",
-    };
-  }
-
-  const cookie = request.headers.get("cookie");
-  if (!cookie) {
-    return {
-      productImageUrl,
-      usedPreRmbg: false,
-      reason: "missing_cookie",
-    };
-  }
-
-  const candidateUrls = buildPreRmbgCandidateUrls(request);
-  let lastReason = "no_candidate_url";
-
-  logger.info("pre_rmbg_started", {
-    requestId,
-    candidateCount: candidateUrls.length,
-  });
-
-  for (const rmbgUrl of candidateUrls) {
-    const controller = new AbortController();
-    const timeoutId = setTimeout(() => controller.abort(), SCENE_FUSION_PRE_RMBG_TIMEOUT_MS);
-    try {
-      const response = await fetch(rmbgUrl, {
-        method: "POST",
-        headers: {
-          "Content-Type": "application/json",
-          cookie,
-        },
-        body: JSON.stringify({
-          imageUrl: productImageUrl,
-          prompt: "场景裂变预处理-抠图",
-          skipGallerySave: true,
-        }),
-        signal: controller.signal,
-      });
-
-      const payload = await response.json().catch(() => null) as Record<string, unknown> | null;
-
-      if (!response.ok) {
-        lastReason = `request_failed_${response.status}`;
-        logger.warn("pre_rmbg_candidate_failed", {
-          requestId,
-          status: response.status,
-          detail: payload?.detail || payload?.error || "unknown",
-        });
-        continue;
-      }
-
-      const cleanedUrl = String(payload?.original_url || payload?.thumbnail_url || "").trim();
-      if (!cleanedUrl || cleanedUrl === productImageUrl) {
-        lastReason = cleanedUrl ? "same_as_source" : "empty_result";
-        logger.warn("pre_rmbg_candidate_invalid", {
-          requestId,
-          reason: lastReason,
-        });
-        continue;
-      }
-
-      return {
-        productImageUrl: cleanedUrl,
-        usedPreRmbg: true,
-        provider: String(payload?.provider || "unknown"),
-      };
-    } catch (error) {
-      lastReason = error instanceof Error ? error.message : "exception";
-      logger.warn("pre_rmbg_candidate_exception", error, { requestId });
-    } finally {
-      clearTimeout(timeoutId);
-    }
-  }
-
-  return {
-    productImageUrl,
-    usedPreRmbg: false,
-    reason: lastReason,
-  };
-}
-
 /**
  * 创建缩略图
  */
@@ -2436,12 +2305,13 @@ export async function POST(request: Request) {
       productImageUrl = await uploadBase64ToS3(productImage, "scene-fusion-product");
     }
     const shouldForcePreRmbg = resolvedSceneMode === "random-bg";
-    const preprocessedProduct = await preprocessProductImageWithRmbg(
+    const preprocessedProduct = await preprocessProductImageWithRmbg({
       request,
       requestId,
+      userId: session.user.id,
       productImageUrl,
-      shouldForcePreRmbg ? true : config.preRmbgEnabled
+      preRmbgEnabled: shouldForcePreRmbg ? true : config.preRmbgEnabled,
-    );
+    });
     const fusionProductImageUrl = preprocessedProduct.productImageUrl;
     logger.info("pre_rmbg_resolved", {
       requestId,

app/api/site-settings/route.ts

@@ -10,7 +10,8 @@ import {
   systemSettingSnapshot,
   systemSettings,
 } from "@/lib/db/schema";
-import { and, eq, inArray } from "drizzle-orm";
+import { and, eq, inArray, sql } from "drizzle-orm";
+import { omitAgentWorkflowPrompts } from "@/lib/agents/workflow-loading";
 import { auth } from "@/app/(auth)/auth";
 import { isAgentWorkflowAdminType, isSiteAdminType } from "@/lib/middleware/admin";
 import {
@@ -553,6 +554,8 @@ function normalizeAgentCategoryTreeConfig(value: unknown): AgentCategoryTreeConf
 type PublicSiteSettingsScope =
   | "agent-brand-model"
   | "agent-canvas"
+  | "agent-canvas-base"
+  | "agent-workflow-templates"
   | "agent-entry"
   | "agent-presets"
   | "auth"
@@ -565,6 +568,8 @@ type PublicSiteSettingsScope =
 const PUBLIC_SITE_SETTINGS_SCOPES = new Set<string>([
   "agent-brand-model",
   "agent-canvas",
+  "agent-canvas-base",
+  "agent-workflow-templates",
   "agent-entry",
   "agent-presets",
   "auth",
@@ -682,7 +687,7 @@ function createScopedSiteSettingsResponse(
   return response;
 }
 
-async function readScopedSiteSettings(keys: string[]) {
+async function readScopedSiteSettings(keys: string[], omitWorkflowSteps = false) {
   const [settings, settingRows] = await Promise.all([
     db
       .select()
@@ -690,8 +695,14 @@ async function readScopedSiteSettings(keys: string[]) {
       .limit(1)
       .then((rows) => rows[0]),
     keys.length > 0
-      ? db
+      ? (omitWorkflowSteps
-          .select()
+          ? db.select({
+              key: systemSettings.key,
+              value: sql<unknown>`case when ${systemSettings.key} = ${AGENT_WORKFLOW_UI_CONFIG_KEY}
+                and jsonb_typeof(${systemSettings.value}) = 'object'
+                then ${systemSettings.value} - 'steps' else ${systemSettings.value} end`,
+            })
+          : db.select())
           .from(systemSettings)
           .where(inArray(systemSettings.key, keys))
       : Promise.resolve([]),
@@ -779,8 +790,17 @@ async function getScopedPublicSiteSettings(
     });
   }
 
-  if (scope === "agent-canvas" || scope === "agent-entry") {
+  if (scope === "agent-workflow-templates") {
-    const { settings, valueByKey } = await readScopedSiteSettings(AGENT_CANVAS_SETTING_KEYS);
+    const [setting] = await db.select({ value: systemSettings.value })
+      .from(systemSettings).where(eq(systemSettings.key, AGENT_WORKFLOW_UI_CONFIG_KEY)).limit(1);
+    const config = normalizeAgentWorkflowUiConfig(setting?.value);
+    return createScopedSiteSettingsResponse(scope, {
+      steps: omitAgentWorkflowPrompts(config.steps),
+    }, "MISS", options.cacheKey || scope, { etag: options.etag });
+  }
+
+  if (scope === "agent-canvas" || scope === "agent-canvas-base" || scope === "agent-entry") {
+    const { settings, valueByKey } = await readScopedSiteSettings(AGENT_CANVAS_SETTING_KEYS, scope !== "agent-canvas");
     const canvasFeatureAvailability = await readCanvasFeatureAvailability(
       valueByKey
     );
@@ -831,6 +851,8 @@ async function getScopedPublicSiteSettings(
               pageFeatureSettings: rawUiConfig?.pageFeatureSettings,
               businessModeSettings: rawUiConfig?.businessModeSettings,
             }
+          : scope === "agent-canvas-base"
+            ? { ...rawUiConfig, steps: [] }
             : rawUiConfig
       ),
       agentWorkflowShowcaseConfig: normalizeAgentWorkflowShowcaseConfig(
@@ -1090,7 +1112,8 @@ export async function GET(request: NextRequest) {
       const cacheKey = brandName.trim()
         ? `${scopedScope}:${brandName.trim().toLowerCase()}`
         : scopedScope;
-      const etag = scopedScope === "agent-canvas" || scopedScope === "agent-entry"
+      const etag = scopedScope === "agent-canvas" || scopedScope === "agent-entry" ||
+        scopedScope === "agent-canvas-base" || scopedScope === "agent-workflow-templates"
         ? await getAgentCanvasSettingsEtag(scopedScope)
         : undefined;
       if (etag && request.headers.get("If-None-Match") === etag) {

app/canvas/[id]/CanvasEditorLegacyPageClient.tsx

@@ -1,7 +1,11 @@
 "use client";
 
 import { createCanvasSaveQueue } from "@/lib/client/canvas-save-queue";
-import { CanvasRemoteOperationContext } from "@/components/canvas/CanvasRemoteOperationContext";
+import { readCanvasDraft, writeCanvasDraft, clearCanvasDraft } from "@/lib/client/canvas-draft";
+import { mergeCanvasSnapshots } from "@/lib/video-canvas/merge-snapshot";
+import { BEFORE_PAGE_REFRESH, type PageRefreshRequest } from "@/lib/client/page-refresh";
+import { CanvasRemoteOperationContext, type CanvasRemoteOperation, type CanvasRemoteOperationResult } from "@/components/canvas/CanvasRemoteOperationContext";
+import equal from "fast-deep-equal";
 import {
   AlertCircle,
   AlertTriangle,
@@ -168,6 +172,7 @@ import {
   type VideoCanvasSymbolMarkerId,
 } from "@/lib/canvas/video-canvas-markers";
 import {
+  isCanvasImageUploadPending,
   LOCAL_UPLOAD_PENDING_METADATA_KEY,
   LOCAL_UPLOAD_PREVIEW_METADATA_KEY,
 } from "@/lib/canvas/local-upload-state";
@@ -228,7 +233,8 @@ import {
   type WorkflowSceneRecord,
 } from "@/lib/video-workflow/runtime";
 import { agentProjectService } from "@/services/agent-projects";
-import { fetchCanvasSiteSettings } from "@/lib/client/canvas-site-settings";
+import { getWorkflowSelectionsRequest } from "@/lib/agents/workflow-loading";
+import { fetchCanvasSiteSettings, fetchWorkflowTemplatePrompts } from "@/lib/client/canvas-site-settings";
 import {
   canvasService,
   imageGenerationService,
@@ -268,6 +274,17 @@ import type {
 const CANVAS_SITE_SETTINGS_REFRESH_INTERVAL_MS = 15000;
 const CANVAS_SURFACE_BACKGROUND = "#f5f5f5";
 
+function WorkflowLoadState({ name, error, retrying, onRetry }: { name: string; error?: Error; retrying?: boolean; onRetry: () => void }) {
+  const failed = Boolean(error && !retrying);
+  const timedOut = error?.name === "AbortError" || error?.name === "TimeoutError";
+  return (
+    <div className="flex items-center gap-3 rounded-xl border border-white/10 px-4 py-3 text-sm text-white/65" role={failed ? "alert" : "status"}>
+      <span>{failed ? `${name}${timedOut ? "加载超时" : "加载失败"}` : `正在加载${name}…`}</span>
+      {failed && <Button type="button" size="sm" variant="outline" onClick={onRetry}>重试</Button>}
+    </div>
+  );
+}
+
 function CanvasLazyPanelLoader({
   label,
   className,
@@ -1929,6 +1946,12 @@ export default function CanvasEditorLegacyPage({
     () => !initialProjectForCurrentRoute
   );
   const [isSaving, setIsSaving] = useState(false);
+  const [canvasLoadError, setCanvasLoadError] = useState("");
+  const [canvasLoadAttempt, setCanvasLoadAttempt] = useState(0);
+  const canvasReadyRef = useRef(Boolean(initialProjectForCurrentRoute));
+  const savedCanvasSnapshotRef = useRef<{ id: string; snapshot: string } | null>(null);
+  const canvasSyncErrorRef = useRef("");
+  const [canvasSyncConflicts, setCanvasSyncConflicts] = useState<string[]>([]);
   const [isEditingTitle, setIsEditingTitle] = useState(false);
   const [isAddImageDialogOpen, setIsAddImageDialogOpen] = useState(false);
   const [editTitle, setEditTitle] = useState("");
@@ -2165,13 +2188,13 @@ export default function CanvasEditorLegacyPage({
   );
   const canvasSiteSettingsKey = requestedAgentMode
     ? hasActiveAgentProject
-      ? "/api/site-settings?scope=agent-canvas"
+      ? "/api/site-settings?scope=agent-canvas-base"
       : "/api/site-settings?scope=agent-entry"
     : "/api/site-settings?scope=canvas";
   const [hasResolvedCanvasSiteSettings, setHasResolvedCanvasSiteSettings] =
     useState(false);
 
-  const { data: siteSettingsData } = useSWR<{
+  const { data: siteSettingsData, error: siteSettingsError, isValidating: siteSettingsLoading, mutate: reloadSiteSettings } = useSWR<{
     siteName?: string;
     siteLogo?: string | null;
     siteLogoDark?: string | null;
@@ -2202,6 +2225,7 @@ export default function CanvasEditorLegacyPage({
       ? 0
       : CANVAS_SITE_SETTINGS_REFRESH_INTERVAL_MS,
     errorRetryCount: 1,
+    shouldRetryOnError: !requestedAgentMode || !hasActiveAgentProject,
     dedupingInterval: 30_000,
     revalidateOnFocus: true,
     revalidateOnReconnect: true,
@@ -2268,9 +2292,34 @@ export default function CanvasEditorLegacyPage({
     !requestedAgentMode ||
     !agentProjectId ||
     loadedAgentProjectId === agentProjectId;
+  const [workflowTemplateMarker, setWorkflowTemplateMarker] = useState<HTMLDivElement | null>(null);
+  const [workflowTemplatesRequested, setWorkflowTemplatesRequested] = useState(false);
+  const hasWorkflowBase = Boolean(siteSettingsData?.agentWorkflowUiConfig);
+  useEffect(() => {
+    if (!isAgentMode || !hasActiveAgentProject || !hasWorkflowBase || workflowTemplatesRequested) return;
+    const element = workflowTemplateMarker;
+    if (!element) return;
+    const observer = new IntersectionObserver(([entry]) => {
+      if (entry?.isIntersecting) setWorkflowTemplatesRequested(true);
+    });
+    observer.observe(element);
+    return () => observer.disconnect();
+  }, [hasActiveAgentProject, hasWorkflowBase, isAgentMode, workflowTemplateMarker, workflowTemplatesRequested]);
+  const { data: workflowTemplates, error: workflowTemplatesError, isValidating: workflowTemplatesLoading, mutate: reloadWorkflowTemplates } = useSWR<{
+    steps: AgentWorkflowUiConfig["steps"];
+  }>(
+    isAgentMode && hasActiveAgentProject && hasWorkflowBase && workflowTemplatesRequested
+      ? "/api/site-settings?scope=agent-workflow-templates"
+      : null,
+    fetchCanvasSiteSettings,
+    { shouldRetryOnError: false }
+  );
   const resolvedWorkflowUiConfig = useMemo(
-    () => siteSettingsData?.agentWorkflowUiConfig || defaultAgentWorkflowUiConfig,
+    () => {
-    [siteSettingsData?.agentWorkflowUiConfig]
+      const base = siteSettingsData?.agentWorkflowUiConfig || defaultAgentWorkflowUiConfig;
+      return requestedAgentMode ? { ...base, steps: workflowTemplates?.steps ?? [] } : base;
+    },
+    [requestedAgentMode, siteSettingsData?.agentWorkflowUiConfig, workflowTemplates?.steps]
   );
   const workflowPageFeatureSettings = useMemo(
     () => getAgentWorkflowPageFeatureSettings(resolvedWorkflowUiConfig),
@@ -2319,7 +2368,7 @@ export default function CanvasEditorLegacyPage({
   });
   const sanitizedWorkflowSelections = useMemo(
     () =>
-      requestedAgentMode && !siteSettingsData?.agentWorkflowUiConfig
+      requestedAgentMode && !workflowTemplates
         ? workflowSelections
         : sanitizeAgentWorkflowSelections({
             config: resolvedWorkflowUiConfig || defaultAgentWorkflowUiConfig,
@@ -2327,7 +2376,7 @@ export default function CanvasEditorLegacyPage({
           }),
     [
       requestedAgentMode,
-      siteSettingsData?.agentWorkflowUiConfig,
+      workflowTemplates,
       resolvedWorkflowUiConfig,
       workflowSelections,
     ]
@@ -2335,6 +2384,14 @@ export default function CanvasEditorLegacyPage({
   const deferredSanitizedWorkflowSelections = useDeferredValue(
     sanitizedWorkflowSelections
   );
+  const workflowSelectionRequest = isAgentMode && hasActiveAgentProject && hasLoadedCurrentAgentProject
+    ? getWorkflowSelectionsRequest(sanitizedWorkflowSelections)
+    : "";
+  const { data: workflowPromptData, error: workflowPromptError, isValidating: workflowPromptLoading, mutate: reloadWorkflowPrompts } = useSWR(
+    workflowSelectionRequest ? ["/api/agent-workflow/template-prompts", workflowSelectionRequest] as const : null,
+    fetchWorkflowTemplatePrompts,
+    { shouldRetryOnError: false }
+  );
   const resolvedBrandModelConfig = useMemo(
     () =>
       normalizeAgentWorkflowBrandModelConfig(
@@ -3365,6 +3422,32 @@ export default function CanvasEditorLegacyPage({
     return () => window.clearTimeout(timeoutId);
   }, []);
 
+  const loadPersistedCanvasState = useCallback((input: CanvasState | null | undefined) => {
+    const canvasData = input || { nodes: [], edges: [], selectedNodeIds: [], viewport: { x: 0, y: 0, zoom: 1 }, tool: "select" as const };
+    const base = JSON.stringify({ canvasData });
+    savedCanvasSnapshotRef.current = { id, snapshot: base };
+    externalCanvasConflictRef.current = false;
+    setCanvasSyncConflicts([]);
+    const draft = readCanvasDraft(id);
+    if (draft) {
+      const merged = mergeCanvasSnapshots(draft.base, draft.snapshot, base);
+      if (merged.conflicts.length) {
+        externalCanvasConflictRef.current = true;
+        savedCanvasSnapshotRef.current = { id, snapshot: draft.base };
+        setCanvasSyncConflicts(merged.conflicts);
+        canvasSyncErrorRef.current = "画布同步发生冲突，改动已保留。请在画布上方选择保留本页或云端的冲突内容，再继续操作。";
+        useCanvasStore.getState().loadCanvas(JSON.parse(merged.snapshot).canvasData);
+        toast.warning(canvasSyncErrorRef.current);
+        return;
+      }
+      useCanvasStore.getState().loadCanvas(JSON.parse(merged.snapshot).canvasData);
+      if (merged.snapshot !== base) writeCanvasDraft(id, { base, snapshot: merged.snapshot });
+      else clearCanvasDraft(id);
+      return;
+    }
+    useCanvasStore.getState().loadCanvas(canvasData);
+  }, [id]);
+
   const hydrateCanvasProject = useCallback(
     (project: CanvasInitialProject) => {
       externalCanvasConflictRef.current = false;
@@ -3374,9 +3457,9 @@ export default function CanvasEditorLegacyPage({
       useCanvasStore
         .getState()
         .setCanvasRevision(projectUpdatedAt, projectUpdatedAt);
+      loadPersistedCanvasState(project.canvasData);
 
       if (project.canvasData) {
-        useCanvasStore.getState().loadCanvas(project.canvasData);
         const persistedWorkflow = project.canvasData.workflowState;
         if (!requestedAgentMode && persistedWorkflow) {
           const nextAppearanceRecognitionEnabled =
@@ -3479,7 +3562,7 @@ export default function CanvasEditorLegacyPage({
 
       setWorkflowHydrationSource("empty");
     },
-    [id, requestedAgentMode]
+    [id, requestedAgentMode, loadPersistedCanvasState]
   );
 
   useLayoutEffect(() => {
@@ -3487,6 +3570,7 @@ export default function CanvasEditorLegacyPage({
     if (lastLoadedCanvasIdRef.current === id) return;
 
     hydrateCanvasProject(initialProjectForCurrentRoute);
+    canvasReadyRef.current = true;
     setIsLoading(false);
     lastLoadedCanvasIdRef.current = id;
   }, [hydrateCanvasProject, id, initialProjectForCurrentRoute]);
@@ -3494,6 +3578,7 @@ export default function CanvasEditorLegacyPage({
   // 加载画布数据
   useEffect(() => {
     console.log("[Canvas] Loading project:", id);
+    let cancelled = false;
 
     const loadProject = async () => {
       if (lastLoadedCanvasIdRef.current === id) {
@@ -3502,6 +3587,8 @@ export default function CanvasEditorLegacyPage({
       }
 
       setIsLoading(true);
+      canvasReadyRef.current = false;
+      setCanvasLoadError("");
       if (!requestedAgentMode) {
         setWorkflowHydrationSource("pending");
       }
@@ -3534,18 +3621,16 @@ export default function CanvasEditorLegacyPage({
         setLoadedAgentProjectId(null);
       }
 
-      // 🆕 先清空当前画布状态，确保切换时不会显示旧数据
-      useCanvasStore.getState().clearCanvas();
-
       const result = await canvasService.getProject(id);
+      if (cancelled) return;
 
       if (result.success && result.data) {
         useCanvasStore.getState().setProject(id, result.data.title);
         useCanvasStore
           .getState()
           .setCanvasRevision(String(result.data.updatedAt || ""), String(result.data.updatedAt || ""));
+        loadPersistedCanvasState(result.data.canvasData);
         if (result.data.canvasData) {
-          useCanvasStore.getState().loadCanvas(result.data.canvasData);
           const persistedWorkflow = result.data.canvasData.workflowState;
           if (!requestedAgentMode && persistedWorkflow) {
             const nextAppearanceRecognitionEnabled =
@@ -3662,8 +3747,15 @@ export default function CanvasEditorLegacyPage({
           return;
         }
 
-        // 画布不存在时，创建一个新画布
+        if (result.status !== 404) {
+          setCanvasLoadError(result.error || "画布暂时无法读取，请检查网络后重试加载。现有内容未被覆盖。");
+          setIsLoading(false);
+          return;
+        }
+
+        // Only an explicit missing project can create a new empty canvas.
         console.log("[Canvas] 画布不存在，创建新画布:", id);
+        useCanvasStore.getState().clearCanvas();
         useCanvasStore
           .getState()
           .setProject(
@@ -3690,15 +3782,20 @@ export default function CanvasEditorLegacyPage({
           }
         }
       }
+      if (cancelled) return;
+      canvasReadyRef.current = true;
       setIsLoading(false);
       lastLoadedCanvasIdRef.current = id;
     };
 
     loadProject();
+    return () => { cancelled = true; };
   }, [
     activeCanvasWorkspaceType,
     defaultCanvasTitle,
     id,
+    canvasLoadAttempt,
+    loadPersistedCanvasState,
     openLoginDialog,
     requestedAgentMode,
   ]);
@@ -5071,15 +5168,69 @@ export default function CanvasEditorLegacyPage({
   const canvasAutosaveTimer = useRef<ReturnType<typeof setTimeout> | null>(null);
   const canvasPersistenceScope = useRef(id);
   const canvasRemoteOperationActive = useRef(false);
+  const canvasLeaveApprovedRef = useRef(false);
+  const [canvasLeaveUrl, setCanvasLeaveUrl] = useState("");
+  const [isSavingBeforeLeave, setIsSavingBeforeLeave] = useState(false);
+  const [canvasLeaveError, setCanvasLeaveError] = useState("");
   canvasPersistenceScope.current = id;
+  const hasUnsavedCanvasChanges = useCallback(() => {
+    if (!canvasReadyRef.current || useCanvasStore.getState().projectId !== id || savedCanvasSnapshotRef.current?.id !== id) return false;
+    if (useCanvasStore.getState().nodes.some(isCanvasImageUploadPending)) return true;
+    const saved = JSON.parse(savedCanvasSnapshotRef.current.snapshot).canvasData as CanvasState;
+    const current = JSON.parse(JSON.stringify(buildPersistedCanvasData())) as CanvasState;
+    const content = (value: CanvasState) => [value.nodes.map(node => {
+      const { updatedAt: _updatedAt, ...nodeData } = node;
+      return { ...nodeData, connections: node.connections || [] };
+    }), value.edges || [], value.suppressedMediaKeys || [], normalizeStyleProPersistedState(value.styleProState)];
+    return !equal(content(saved), content(current));
+  }, [buildPersistedCanvasData, id]);
+  const requestCanvasLeave = useCallback((url: string) => {
+    if (hasUnsavedCanvasChanges()) {
+      setCanvasLeaveError("");
+      setCanvasLeaveUrl(url);
+      return;
+    }
+    canvasLeaveApprovedRef.current = true;
+    window.location.assign(url);
+  }, [hasUnsavedCanvasChanges]);
+  const applyCanvasRemoteSnapshot = useCallback((result: CanvasRemoteOperationResult) => {
+    if (result.projectId !== id || canvasPersistenceScope.current !== id || useCanvasStore.getState().projectId !== id) return false;
+    const remoteSnapshot = JSON.stringify({ canvasData: result.canvasData });
+    const merged = mergeCanvasSnapshots(
+      savedCanvasSnapshotRef.current?.id === id ? savedCanvasSnapshotRef.current.snapshot : remoteSnapshot,
+      JSON.stringify({ canvasData: buildPersistedCanvasData() }),
+      remoteSnapshot,
+    );
+    if (merged.changed) useCanvasStore.getState().loadCanvas(JSON.parse(merged.snapshot).canvasData);
+    useCanvasStore.getState().setCanvasRevision(result.updatedAt, result.updatedAt);
+    if (merged.conflicts.length) {
+      canvasSyncErrorRef.current = "画布同步发生冲突，改动已保留。请在画布上方选择保留本页或云端的冲突内容，再继续操作。";
+      if (!externalCanvasConflictRef.current) toast.warning(canvasSyncErrorRef.current);
+      externalCanvasConflictRef.current = true;
+      setCanvasSyncConflicts(merged.conflicts);
+      writeCanvasDraft(id, { base: savedCanvasSnapshotRef.current?.snapshot || remoteSnapshot, snapshot: merged.snapshot });
+      return false;
+    }
+    savedCanvasSnapshotRef.current = { id, snapshot: remoteSnapshot };
+    externalCanvasConflictRef.current = false;
+    setCanvasSyncConflicts([]);
+    canvasSyncErrorRef.current = "";
+    return true;
+  }, [buildPersistedCanvasData, id]);
   const persistCanvasStateNow = useCallback(
     async (reason: "autosave" | "delete" | "beforeunload") => {
-      if (canvasPersistenceScope.current !== id) return false;
+      if (canvasLeaveApprovedRef.current || canvasPersistenceScope.current !== id || !canvasReadyRef.current || useCanvasStore.getState().projectId !== id) return false;
+      if (externalCanvasConflictRef.current) return false;
       setIsSaving(true);
       try {
-        const canvasData = buildPersistedCanvasData();
+        let canvasData = buildPersistedCanvasData();
+        let snapshot = JSON.stringify({ canvasData });
+        if (savedCanvasSnapshotRef.current?.id === id && equal(JSON.parse(savedCanvasSnapshotRef.current.snapshot), JSON.parse(snapshot))) {
+          clearCanvasDraft(id);
+          return true;
+        }
         const { canvasRevision, canvasUpdatedAt } = useCanvasStore.getState();
-        const result = await canvasService.saveCanvasState(
+        let result = await canvasService.saveCanvasState(
           id,
           canvasData,
           activeCanvasWorkspaceType,
@@ -5089,23 +5240,53 @@ export default function CanvasEditorLegacyPage({
           }
         );
         if (canvasPersistenceScope.current !== id) return false;
-        if (!result.success) {
+        if (result.status === 409 && savedCanvasSnapshotRef.current?.id === id) {
-          console.error(`[Canvas] ${reason} save failed:`, result.error);
+          const remote = await canvasService.getProject(id);
-          if (result.status === 409) {
+          if (canvasPersistenceScope.current !== id) return false;
-            externalCanvasConflictRef.current = true;
+          if (remote.success && remote.data?.canvasData) {
-            console.warn("[Canvas] stale save revision handled without user prompt", {
+            const remoteSnapshot = JSON.stringify({ canvasData: remote.data.canvasData });
-              reason,
+            const merged = mergeCanvasSnapshots(
-              canvasUpdatedAt: result.canvasUpdatedAt,
+              savedCanvasSnapshotRef.current.snapshot,
+              JSON.stringify({ canvasData: buildPersistedCanvasData() }),
+              remoteSnapshot,
+            );
+            if (!merged.conflicts.length) {
+              canvasData = JSON.parse(merged.snapshot).canvasData;
+              snapshot = merged.snapshot;
+              savedCanvasSnapshotRef.current = { id, snapshot: remoteSnapshot };
+              useCanvasStore.getState().loadCanvas(canvasData);
+              const revision = String(remote.data.updatedAt);
+              useCanvasStore.getState().setCanvasRevision(revision, revision);
+              result = await canvasService.saveCanvasState(id, canvasData, activeCanvasWorkspaceType, {
+                baseCanvasRevision: revision, baseCanvasUpdatedAt: revision,
               });
-            if (!externalCanvasConflictNotifiedRef.current) {
+              if (canvasPersistenceScope.current !== id) return false;
-              externalCanvasConflictNotifiedRef.current = true;
+            } else {
-              toast.warning("画布已被外部操作更新，本地改动未覆盖远端；请刷新后继续编辑");
+              externalCanvasConflictRef.current = true;
+              setCanvasSyncConflicts(merged.conflicts);
             }
           }
-        } else if (result.data?.updatedAt) {
+        }
+        if (!result.success) {
+          const retained = writeCanvasDraft(id, {
+            base: savedCanvasSnapshotRef.current?.id === id ? savedCanvasSnapshotRef.current.snapshot : JSON.stringify({ canvasData: { nodes: [], edges: [] } }),
+            snapshot: JSON.stringify({ canvasData: buildPersistedCanvasData() }),
+          });
+          canvasSyncErrorRef.current = result.status === 409
+            ? "画布同步发生冲突，改动已保留。请在画布上方选择保留本页或云端的冲突内容，再继续操作。"
+            : `画布自动同步失败${result.status ? `（HTTP ${result.status}）` : "（网络连接失败）"}。${retained ? "本地草稿已保留，系统会继续自动同步，也可稍后重试。" : "请保留当前页面，检查网络后重试同步，暂勿刷新。"}`;
+          console.error(`[Canvas] ${reason} save failed:`, result.error);
+        } else {
+          canvasSyncErrorRef.current = "";
+          savedCanvasSnapshotRef.current = { id, snapshot };
+          clearCanvasDraft(id);
           externalCanvasConflictRef.current = false;
+          setCanvasSyncConflicts([]);
           externalCanvasConflictNotifiedRef.current = false;
-          useCanvasStore
+          if (result.data?.canvasData && result.data?.updatedAt) {
+            return applyCanvasRemoteSnapshot({ projectId: id, canvasData: result.data.canvasData, updatedAt: String(result.data.updatedAt) });
+          }
+          if (result.data?.updatedAt) useCanvasStore
             .getState()
             .setCanvasRevision(String(result.data.updatedAt), String(result.data.updatedAt));
         }
@@ -5114,7 +5295,7 @@ export default function CanvasEditorLegacyPage({
         if (canvasPersistenceScope.current === id) setIsSaving(false);
       }
     },
-    [activeCanvasWorkspaceType, buildPersistedCanvasData, id]
+    [activeCanvasWorkspaceType, applyCanvasRemoteSnapshot, buildPersistedCanvasData, id]
   );
 
   const persistCanvasState = useCallback(
@@ -5123,35 +5304,139 @@ export default function CanvasEditorLegacyPage({
     [persistCanvasStateNow]
   );
 
+  const finishCanvasLeave = useCallback(async (save: boolean) => {
+    if (!canvasLeaveUrl || isSavingBeforeLeave) return;
+    setCanvasLeaveError("");
+    if (save && useCanvasStore.getState().nodes.some(isCanvasImageUploadPending)) {
+      setCanvasLeaveError("还有图片未上传成功。请等待上传完成；若上传失败，请重新上传或移除该图片后再保存并离开。");
+      return;
+    }
+    if (canvasAutosaveTimer.current) {
+      clearTimeout(canvasAutosaveTimer.current);
+      canvasAutosaveTimer.current = null;
+    }
+    if (save) {
+      setIsSavingBeforeLeave(true);
+      try {
+        if (!(await persistCanvasState("autosave"))) throw new Error(canvasSyncErrorRef.current || "画布暂时无法同步，请保留此页并稍后重试。");
+        if (hasUnsavedCanvasChanges() && !(await persistCanvasState("autosave"))) throw new Error(canvasSyncErrorRef.current);
+        if (hasUnsavedCanvasChanges()) throw new Error("还有改动正在同步，请稍后重试离开。");
+      } catch (error) {
+        setCanvasLeaveError(error instanceof Error ? error.message : "画布暂时无法同步，请保留此页并稍后重试。");
+        setIsSavingBeforeLeave(false);
+        return;
+      }
+    }
+    canvasLeaveApprovedRef.current = true;
+    clearCanvasDraft(id);
+    window.location.assign(canvasLeaveUrl);
+  }, [canvasLeaveUrl, hasUnsavedCanvasChanges, id, isSavingBeforeLeave, persistCanvasState]);
+
+  const resolveCanvasSyncConflict = useCallback((choice: "local" | "remote") => {
+    return canvasSaveQueue.current!.enqueue(async () => {
+      setIsSaving(true);
+      try {
+        const remote = await canvasService.getProject(id);
+        if (canvasPersistenceScope.current !== id || useCanvasStore.getState().projectId !== id) return;
+        if (!remote.success || !remote.data?.canvasData || savedCanvasSnapshotRef.current?.id !== id) {
+          throw new Error(remote.error || "画布暂时无法读取，改动已保留，请稍后重试同步。");
+        }
+        const remoteSnapshot = JSON.stringify({ canvasData: remote.data.canvasData });
+        const merged = mergeCanvasSnapshots(
+          savedCanvasSnapshotRef.current.snapshot,
+          JSON.stringify({ canvasData: buildPersistedCanvasData() }),
+          remoteSnapshot,
+          choice,
+        );
+        savedCanvasSnapshotRef.current = { id, snapshot: remoteSnapshot };
+        useCanvasStore.getState().loadCanvas(JSON.parse(merged.snapshot).canvasData);
+        const revision = String(remote.data.updatedAt);
+        useCanvasStore.getState().setCanvasRevision(revision, revision);
+        externalCanvasConflictRef.current = false;
+        canvasSyncErrorRef.current = "";
+        setCanvasSyncConflicts([]);
+        if (!(await persistCanvasStateNow("autosave"))) throw new Error(canvasSyncErrorRef.current);
+        toast.success("画布已合并同步，可以继续操作");
+      } catch (error) {
+        toast.error(error instanceof Error ? error.message : "画布同步失败，改动已保留，请稍后重试。");
+      } finally {
+        if (canvasPersistenceScope.current === id) setIsSaving(false);
+      }
+    });
+  }, [buildPersistedCanvasData, id, persistCanvasStateNow]);
+
   const runCanvasRemoteOperation = useCallback(
-    (operation: () => Promise<void>) => {
+    (operation: CanvasRemoteOperation) => {
       if (canvasAutosaveTimer.current) {
         clearTimeout(canvasAutosaveTimer.current);
         canvasAutosaveTimer.current = null;
       }
       return canvasSaveQueue.current!.enqueueOperation(
-        () => persistCanvasStateNow("autosave"),
+        async () => {
+          const saved = await persistCanvasStateNow("autosave");
+          if (!saved) throw new Error(canvasSyncErrorRef.current ? `${canvasSyncErrorRef.current} 本次处理未提交。` : "画布尚未完成加载，本次处理未提交，请等待加载完成后重试。");
+          return true;
+        },
         async () => {
           canvasRemoteOperationActive.current = true;
           try {
-            await operation();
+            const result = await operation();
+            if (result && result.projectId === id && canvasPersistenceScope.current === id) {
+              savedCanvasSnapshotRef.current = { id, snapshot: JSON.stringify({ canvasData: result.canvasData }) };
+              canvasSyncErrorRef.current = "";
+            }
           } finally {
             canvasRemoteOperationActive.current = false;
           }
         }
       );
     },
-    [persistCanvasStateNow]
+    [persistCanvasStateNow, id]
   );
 
-  const persistCanvasBeforeAgent = useCallback(() => {
+  const persistCanvasBeforeAgent = useCallback(async () => {
+    if (!canvasReadyRef.current || useCanvasStore.getState().projectId !== id || externalCanvasConflictRef.current)
+      throw new Error(canvasSyncErrorRef.current ? `${canvasSyncErrorRef.current} 本次任务未提交。` : "画布尚未完成同步，本次任务未提交，请保留当前页面并重试同步。");
+    if (savedCanvasSnapshotRef.current?.id === id) {
+      if (!hasUnsavedCanvasChanges()) return true;
+    }
     // Flush the pending local edit once instead of racing its scheduled autosave.
     if (canvasAutosaveTimer.current) {
       clearTimeout(canvasAutosaveTimer.current);
       canvasAutosaveTimer.current = null;
     }
-    return persistCanvasState("autosave");
+    if (!(await persistCanvasState("autosave"))) throw new Error(canvasSyncErrorRef.current ? `${canvasSyncErrorRef.current} 本次任务未提交。` : "画布尚未完成加载，本次任务未提交；请等待加载完成后再次发送。");
-  }, [persistCanvasState]);
+    return true;
+  }, [persistCanvasState, hasUnsavedCanvasChanges, id]);
+
+  const canvasRemoteOperationContext = useMemo(() => ({
+    run: runCanvasRemoteOperation,
+    applySnapshot: applyCanvasRemoteSnapshot,
+  }), [runCanvasRemoteOperation, applyCanvasRemoteSnapshot]);
+
+  useEffect(() => {
+    if (isVideoMode) return;
+    const beforeRefresh = (event: Event) => {
+      const request = (event as CustomEvent<PageRefreshRequest>).detail;
+      if (!isAgentMode && useCanvasStore.getState().nodes.some(isCanvasImageUploadPending)) {
+        request.block("还有图片未上传成功。请等待上传完成；若上传失败，请重新上传或移除该图片后再刷新。");
+        return;
+      }
+      if (useCanvasStore.getState().isGenerating) {
+        request.block("当前图片任务仍在处理中，请等待结果返回后再刷新。");
+        return;
+      }
+      request.save(async () => {
+        if (isAgentMode) {
+          if (agentProjectId && hasLoadedCurrentAgentProject && !(await persistAgentProject("switch"))) throw new Error("生图项目同步失败，请保留此页并重试刷新。");
+        } else if (canvasReadyRef.current && !(await persistCanvasState("autosave"))) {
+          throw new Error(canvasSyncErrorRef.current || "画布尚未完成同步，请保留此页并重试刷新。");
+        }
+      });
+    };
+    window.addEventListener(BEFORE_PAGE_REFRESH, beforeRefresh);
+    return () => window.removeEventListener(BEFORE_PAGE_REFRESH, beforeRefresh);
+  }, [isVideoMode, isAgentMode, agentProjectId, hasLoadedCurrentAgentProject, persistAgentProject, persistCanvasState]);
 
   // 自动保存逻辑
   useEffect(() => {
@@ -5172,7 +5457,32 @@ export default function CanvasEditorLegacyPage({
       clearTimeout(saveTimer);
       if (canvasAutosaveTimer.current === saveTimer) canvasAutosaveTimer.current = null;
     };
-  }, [isAgentMode, isAgentOperationRefreshActive, nodes, isLoading, persistCanvasState]);
+  }, [isAgentMode, isAgentOperationRefreshActive, nodes, edges, isLoading, persistCanvasState]);
+
+  useEffect(() => {
+    if (isLoading || isAgentMode) return;
+    const retrySync = () => {
+      if (canvasLeaveApprovedRef.current || externalCanvasConflictRef.current || canvasRemoteOperationActive.current || isAgentOperationRefreshActive() || !hasUnsavedCanvasChanges()) return;
+      void persistCanvasState("autosave").catch(error => console.error("[Canvas] background sync failed:", error));
+    };
+    const onVisibilityChange = () => {
+      if (!canvasLeaveApprovedRef.current && document.visibilityState === "hidden" && hasUnsavedCanvasChanges()) {
+        writeCanvasDraft(id, { base: savedCanvasSnapshotRef.current!.snapshot, snapshot: JSON.stringify({ canvasData: buildPersistedCanvasData() }) });
+      }
+    };
+    const retryTimer = window.setInterval(() => {
+      if (document.visibilityState === "visible" && navigator.onLine && canvasSyncErrorRef.current) retrySync();
+    }, 20_000);
+    window.addEventListener("online", retrySync);
+    window.addEventListener("focus", retrySync);
+    document.addEventListener("visibilitychange", onVisibilityChange);
+    return () => {
+      window.clearInterval(retryTimer);
+      window.removeEventListener("online", retrySync);
+      window.removeEventListener("focus", retrySync);
+      document.removeEventListener("visibilitychange", onVisibilityChange);
+    };
+  }, [buildPersistedCanvasData, hasUnsavedCanvasChanges, id, isAgentMode, isAgentOperationRefreshActive, isLoading, persistCanvasState]);
 
   useEffect(() => {
     if (isLoading || isAgentOperationRefreshActive()) return;
@@ -5196,6 +5506,7 @@ export default function CanvasEditorLegacyPage({
       }
 
       try {
+        const beforeRead = useCanvasStore.getState();
         const revisionResponse = await fetch(`/api/canvas/${id}/revision`, {
           cache: "no-store",
         });
@@ -5216,7 +5527,11 @@ export default function CanvasEditorLegacyPage({
         }
 
         const result = await canvasService.getProject(id);
-        if (cancelled || canvasRemoteOperationActive.current || !result.success || !result.data) return;
+        const current = useCanvasStore.getState();
+        if (
+          cancelled || canvasRemoteOperationActive.current || !result.success || !result.data ||
+          current.projectId !== id || current.nodes !== beforeRead.nodes || current.edges !== beforeRead.edges
+        ) return;
         useCanvasStore.getState().markAgentOperationRefresh();
         hydrateCanvasProject(result.data);
         lastLocalCanvasMutationAtRef.current = Date.now();
@@ -5270,14 +5585,25 @@ export default function CanvasEditorLegacyPage({
     }
   }, [isAgentMode, isAgentOperationRefreshActive, nodes, isLoading, persistCanvasState]);
 
-  // 页面关闭/刷新前尝试做一次 keepalive 保存，降低“刚删就刷新”回滚概率
+  // 浏览器离开确认只保护尚未同步的内容；真正离开时保留草稿并发送一次保存。
   useEffect(() => {
     if (isLoading || isAgentMode) return;
 
-    const handleBeforeUnload = () => {
+    const retainDraft = () => {
-      try {
+      if (canvasLeaveApprovedRef.current || !hasUnsavedCanvasChanges()) return null;
-        if (isAgentOperationRefreshActive()) return;
       const canvasData = buildPersistedCanvasData();
+      writeCanvasDraft(id, { base: savedCanvasSnapshotRef.current!.snapshot, snapshot: JSON.stringify({ canvasData }) });
+      return canvasData;
+    };
+    const handleBeforeUnload = (event: BeforeUnloadEvent) => {
+      if (!retainDraft()) return;
+      event.preventDefault();
+      event.returnValue = "true";
+    };
+    const handlePageHide = () => {
+      try {
+        const canvasData = retainDraft();
+        if (!canvasData || isSaving || canvasRemoteOperationActive.current || isAgentOperationRefreshActive() || externalCanvasConflictRef.current) return;
         const { canvasRevision, canvasUpdatedAt } = useCanvasStore.getState();
         void fetch(`/api/canvas/${id}`, {
           method: "PUT",
@@ -5296,18 +5622,20 @@ export default function CanvasEditorLegacyPage({
     };
 
     window.addEventListener("beforeunload", handleBeforeUnload);
-    window.addEventListener("pagehide", handleBeforeUnload);
+    window.addEventListener("pagehide", handlePageHide);
     return () => {
       window.removeEventListener("beforeunload", handleBeforeUnload);
-      window.removeEventListener("pagehide", handleBeforeUnload);
+      window.removeEventListener("pagehide", handlePageHide);
     };
   }, [
     activeCanvasWorkspaceType,
     buildPersistedCanvasData,
+    hasUnsavedCanvasChanges,
     id,
     isAgentOperationRefreshActive,
     isAgentMode,
     isLoading,
+    isSaving,
   ]);
 
   // 智能命名与缩略图逻辑
@@ -5391,21 +5719,12 @@ export default function CanvasEditorLegacyPage({
 
   // 保存画布 (手动触发保留作为备用，但UI上移除)
   const handleSave = useCallback(async () => {
-    setIsSaving(true);
+    if (await persistCanvasState("autosave")) {
-    const canvasData = buildPersistedCanvasData();
-    const result = await canvasService.saveCanvasState(
-      id,
-      canvasData,
-      activeCanvasWorkspaceType
-    );
-
-    if (result.success) {
       toast.success("保存成功");
     } else {
-      toast.error(result.error || "保存失败");
+      toast.error(canvasSyncErrorRef.current || "画布同步失败，请检查网络后重试");
     }
-    setIsSaving(false);
+  }, [persistCanvasState]);
-  }, [activeCanvasWorkspaceType, buildPersistedCanvasData, id]);
 
   // 更新标题
   const handleUpdateTitle = async () => {
@@ -9648,6 +9967,8 @@ export default function CanvasEditorLegacyPage({
         selectedBrandModel,
         appearanceRecognitionEnabled,
         selections: deferredSanitizedWorkflowSelections,
+        resolvedSelections: workflowPromptData?.selectionRequest === getWorkflowSelectionsRequest(deferredSanitizedWorkflowSelections)
+          ? workflowPromptData?.selections : undefined,
       });
 
       if (canceled) {
@@ -9670,6 +9991,7 @@ export default function CanvasEditorLegacyPage({
     selectedBrandModel,
     workflowInputs,
     workflowMaterials,
+    workflowPromptData,
   ]);
   useEffect(() => {
     workflowInputsRef.current = workflowInputs;
@@ -9791,15 +10113,23 @@ export default function CanvasEditorLegacyPage({
     [patchPersistedAgentWorkflowState]
   );
   const getLatestWorkflowContext = useCallback(() => {
+    const selections = workflowSelectionsRef.current;
     return buildAgentWorkflowComposerContext({
       config: resolvedWorkflowUiConfig || defaultAgentWorkflowUiConfig,
       inputs: workflowInputsRef.current,
       materials: workflowMaterialsRef.current,
       selectedBrandModel: selectedBrandModelRef.current,
       appearanceRecognitionEnabled: appearanceRecognitionEnabledRef.current,
-      selections: workflowSelectionsRef.current,
+      selections,
+      resolvedSelections: workflowPromptData?.selectionRequest === getWorkflowSelectionsRequest(selections)
+        ? workflowPromptData?.selections : undefined,
     });
-  }, [resolvedWorkflowUiConfig]);
+  }, [resolvedWorkflowUiConfig, workflowPromptData]);
+  const getWorkflowPromptStatus = useCallback(() => {
+    const currentRequest = getWorkflowSelectionsRequest(workflowSelectionsRef.current);
+    if (!currentRequest || currentRequest === workflowPromptData?.selectionRequest) return "ready";
+    return workflowPromptError && currentRequest === workflowSelectionRequest ? "error" : "loading";
+  }, [workflowPromptData, workflowPromptError, workflowSelectionRequest]);
   const effectiveSelectedAgentPresetId = null;
   const { data: selectedAgentPresetResponse } = useSWR<{
     success?: boolean;
@@ -10174,8 +10504,9 @@ export default function CanvasEditorLegacyPage({
       </div>
     ) : null;
 
-  const workflowStylePanel = useMemo(
+  const workflowStylePanel = useMemo(() => (
-    () => (
+    <div ref={setWorkflowTemplateMarker} className="space-y-3">
+      {workflowTemplates ? (
         <AgentWorkflowPanelDarkV2
           config={resolvedWorkflowUiConfig}
           embedded
@@ -10187,17 +10518,31 @@ export default function CanvasEditorLegacyPage({
           selections={sanitizedWorkflowSelections}
           showBrandStoreSection={false}
         />
-    ),
+      ) : siteSettingsError && !siteSettingsData && !siteSettingsLoading ? (
-    [
+        <p className="text-sm text-white/65">请先在上方重试加载品牌和类目。</p>
-      handleWorkflowInputsChange,
+      ) : !workflowTemplatesRequested ? (
-      handleWorkflowMaterialsChange,
+        <Button type="button" variant="outline" onClick={() => setWorkflowTemplatesRequested(true)}>加载风格模板</Button>
-      handleWorkflowSelectionsChange,
+      ) : (
-      resolvedWorkflowUiConfig,
+        <WorkflowLoadState name="风格模板" error={workflowTemplatesError} retrying={workflowTemplatesLoading} onRetry={() => void reloadWorkflowTemplates().catch(() => {})} />
-      sanitizedWorkflowSelections,
+      )}
-      workflowInputs,
+      {workflowPromptError && (
-      workflowMaterials,
+        <WorkflowLoadState name="所选模板的提示词" error={workflowPromptError} retrying={workflowPromptLoading} onRetry={() => void reloadWorkflowPrompts().catch(() => {})} />
-    ]
+      )}
-  );
+    </div>
+  ), [
+    handleWorkflowInputsChange, handleWorkflowMaterialsChange, handleWorkflowSelectionsChange,
+    reloadWorkflowPrompts, reloadWorkflowTemplates, resolvedWorkflowUiConfig, sanitizedWorkflowSelections,
+    siteSettingsData, siteSettingsError, siteSettingsLoading, workflowInputs, workflowMaterials, workflowPromptError,
+    workflowPromptLoading, workflowTemplates, workflowTemplatesError, workflowTemplatesLoading, workflowTemplatesRequested,
+  ]);
+
+  if (canvasLoadError && !isAgentMode) {
+    return <div role="alert" className="flex h-dvh flex-col items-center justify-center gap-4">
+      <p>{canvasLoadError}</p>
+      <Button onClick={() => setCanvasLoadAttempt(value => value + 1)}>重新加载画布</Button>
+      {loginDialogElement}
+    </div>;
+  }
 
   if (isAgentMode) {
     if (!hasActiveAgentProject) {
@@ -10232,17 +10577,20 @@ export default function CanvasEditorLegacyPage({
               theme="dark"
             />
           }
-          brandStorePanel={
+          brandStorePanel={siteSettingsData?.agentWorkflowUiConfig ? (
             <AgentWorkflowBrandStorePanel
               config={resolvedWorkflowUiConfig}
               inputs={workflowInputs}
               onInputsChange={handleWorkflowInputsChange}
               theme="dark"
             />
-          }
+          ) : (
+            <WorkflowLoadState name="品牌和类目" error={siteSettingsError} retrying={siteSettingsLoading} onRetry={() => void reloadSiteSettings().catch(() => {})} />
+          )}
           chatId={agentModeChatId}
           deletedResultCollections={agentProjectDeletedResultCollections}
           getLatestWorkflowContext={getLatestWorkflowContext}
+          getWorkflowPromptStatus={getWorkflowPromptStatus}
           materialSelectionPanel={
             isWorkflowMaterialStepEnabled ? (
               <AgentWorkflowMaterialSelectionPanel
@@ -10302,7 +10650,7 @@ export default function CanvasEditorLegacyPage({
   }
 
   return (
-    <CanvasRemoteOperationContext.Provider value={runCanvasRemoteOperation}>
+    <CanvasRemoteOperationContext.Provider value={canvasRemoteOperationContext}>
     <TooltipProvider>
       <div
         data-canvas-panel-open={isPanelOpen ? "true" : "false"}
@@ -10318,6 +10666,30 @@ export default function CanvasEditorLegacyPage({
         }
       >
         <CanvasAgentUiListener projectId={id} workspace="canvas" />
+        <Dialog open={Boolean(canvasLeaveUrl)} onOpenChange={open => { if (!open && !isSavingBeforeLeave) setCanvasLeaveUrl(""); }}>
+          <DialogContent onEscapeKeyDown={event => { if (isSavingBeforeLeave) event.preventDefault(); }} onPointerDownOutside={event => event.preventDefault()}>
+            <DialogHeader>
+              <DialogTitle>离开前保存画布？</DialogTitle>
+              <DialogDescription>平时会自动保存。当前还有改动尚未同步到云端，可以保存后离开，或放弃这些未同步的改动。</DialogDescription>
+            </DialogHeader>
+            {canvasLeaveError ? <p role="alert" className="text-sm text-destructive">{canvasLeaveError}</p> : null}
+            <DialogFooter className="gap-2">
+              <Button disabled={isSavingBeforeLeave} variant="ghost" onClick={() => setCanvasLeaveUrl("")}>继续编辑</Button>
+              <Button disabled={isSavingBeforeLeave} variant="outline" onClick={() => void finishCanvasLeave(false)}>不保存并离开</Button>
+              <Button disabled={isSavingBeforeLeave} onClick={() => void finishCanvasLeave(true)}>{isSavingBeforeLeave ? "正在保存…" : "保存并离开"}</Button>
+            </DialogFooter>
+          </DialogContent>
+        </Dialog>
+        {canvasSyncConflicts.length > 0 ? (
+          <div role="alert" className="absolute inset-x-3 top-28 z-[60] mx-auto flex max-w-2xl flex-wrap items-center gap-3 rounded-lg border bg-background p-4 text-sm shadow-md">
+            <div className="min-w-0 flex-1 basis-64">
+              <p className="font-medium">画布同步发生冲突</p>
+              <p className="mt-1 text-muted-foreground">本页和云端的同一内容有不同修改。请选择保留哪边的冲突内容，其余图片和修改会合并保留。</p>
+            </div>
+            <Button disabled={isSaving} onClick={() => void resolveCanvasSyncConflict("local")}>保留本页修改</Button>
+            <Button disabled={isSaving} variant="outline" onClick={() => void resolveCanvasSyncConflict("remote")}>保留云端修改</Button>
+          </div>
+        ) : null}
         {/* 1. Canvas Layer (Full Screen) - 使用 key 强制在 id 变化时重新挂载 */}
         <div
           className="absolute inset-0 z-0"
@@ -11027,14 +11399,12 @@ export default function CanvasEditorLegacyPage({
 
         {isVideoMode ? brandEntry : (
           <CanvasSurfaceHeader
-            isSaving={isSaving}
             onAddImage={handleAddImageNode}
-            onHome={goHome}
+            onHome={() => requestCanvasLeave("/")}
             onOpenFiles={() => {
               setIsPanelOpen(true);
               setPanelMode("fileList");
             }}
-            onSave={() => void handleSave()}
             projectTitle={projectTitle}
             rightInset={panelOcclusionRight}
           />
@@ -11139,6 +11509,7 @@ export default function CanvasEditorLegacyPage({
                   createUrl={createNewCanvasUrl}
                   currentId={id}
                   onClose={() => setPanelMode("chat")}
+                  onNavigate={requestCanvasLeave}
                   workspaceLabel={workspaceLabel}
                   workspaceType={activeCanvasWorkspaceType}
                 />

app/canvas/[id]/style-pro/page.tsx

@@ -48,8 +48,13 @@ export default function CanvasStyleProPage() {
       const canvasData = result.data.canvasData;
       const latestState = useCanvasStore.getState();
       setProject(result.data.id, result.data.title);
-      if (latestState.nodes.length === 0 && latestState.edges.length === 0) {
+      if (
+        latestState.projectId !== id ||
+        (latestState.nodes.length === 0 && latestState.edges.length === 0)
+      ) {
         loadCanvas(canvasData);
+        const revision = String(result.data.updatedAt || "");
+        useCanvasStore.getState().setCanvasRevision(revision, revision);
         return;
       }
 

app/layout.tsx

@@ -3,6 +3,7 @@ import { Toaster } from "sonner";
 import { ThemeProvider } from "@/components/theme-provider";
 import { FaviconUpdater } from "@/components/favicon-updater";
 import { ImageDeliveryOptimizer } from "@/components/image-delivery-optimizer";
+import { AppUpdateNotice } from "@/components/app-update-notice";
 import { getSiteSettings } from "@/lib/db/queries";
 
 import "./globals.css";
@@ -215,6 +216,7 @@ export default function RootLayout({
           enableSystem
         >
           <Toaster position="top-center" />
+          <AppUpdateNotice />
           <SessionProvider>{children}</SessionProvider>
         </ThemeProvider>
       </body>

components/agents/AgentGenerationWorkspace.tsx

@@ -1,4 +1,5 @@
 "use client";
+import { downloadOriginalImage, getCanvasImageDownloadErrorMessage } from "@/lib/client/canvas-image-download";
 
 import { useChat } from "@ai-sdk/react";
 import { DefaultChatTransport } from "ai";
@@ -575,31 +576,11 @@ export function AgentGenerationWorkspace({
       toast.error("图片地址无效");
       return;
     }
-
-    const filename = buildDownloadFilename(raw);
     try {
-      const response = await fetch(raw);
+      await downloadOriginalImage({ url: raw, name: buildDownloadFilename(raw) });
-      if (!response.ok) {
+      toast.success("原图已开始下载");
-        throw new Error(`download failed: ${response.status}`);
+    } catch (error) {
-      }
+      toast.error(getCanvasImageDownloadErrorMessage(error));
-      const blob = await response.blob();
-      const blobUrl = window.URL.createObjectURL(blob);
-      const link = document.createElement("a");
-      link.href = blobUrl;
-      link.download = filename;
-      document.body.appendChild(link);
-      link.click();
-      document.body.removeChild(link);
-      window.URL.revokeObjectURL(blobUrl);
-    } catch {
-      const link = document.createElement("a");
-      link.href = raw;
-      link.target = "_blank";
-      link.rel = "noopener noreferrer";
-      document.body.appendChild(link);
-      link.click();
-      document.body.removeChild(link);
-      toast.message("已打开原图，可右键另存为");
     }
   }, []);
 

components/agents/AgentGenerationWorkspaceDarkV2.tsx

@@ -1,6 +1,8 @@
 "use client";
+import { downloadOriginalImage, getCanvasImageDownloadErrorMessage } from "@/lib/client/canvas-image-download";
 
 import { useChat } from "@ai-sdk/react";
+import { BEFORE_PAGE_REFRESH, type PageRefreshRequest } from "@/lib/client/page-refresh";
 import { appendGenerationMessage, mergeGenerationHistory, parseAppendedGenerationMessage, recoverReplacementRun } from "@/lib/agents/replacement-run-recovery";
 import { getSceneRunResult } from "@/lib/agents/scene-run-recovery";
 import type { DetailReplacementBatchCard } from "@/lib/agents/detail-replacement-batch";
@@ -157,6 +159,7 @@ import type {
 } from "@/types/agent";
 import {
   createEmptyAgentModeWorkspaceState,
+  MAX_DETAIL_REPLACEMENT_REFERENCES,
 } from "@/lib/agents/mode-workspace-state";
 import {
   createEmptyAgentGenerationProjectWorkspaceState,
@@ -174,6 +177,7 @@ export interface AgentGenerationWorkspaceDarkV2Props {
   workflowFeatureSettings?: AgentWorkflowPageFeatureSettings | null;
   workflowPromptOptimizationEnabled?: boolean;
   getLatestWorkflowContext?: () => AgentWorkflowComposerContext | null;
+  getWorkflowPromptStatus?: () => "ready" | "loading" | "error";
   onBack?: () => void;
   brandStorePanel?: ReactNode;
   materialSelectionPanel?: ReactNode;
@@ -210,6 +214,7 @@ export interface AgentGenerationWorkspaceDarkV2Props {
 interface AgentWorkflowModelOption {
   id: string;
   displayName: string;
+  providerName?: string;
   providerType: string;
   supportsImageGen?: boolean;
   isMultimodal?: boolean;
@@ -2640,7 +2645,9 @@ function getStoredAgentPendingGenerations(): LocalGenerationPendingState[] {
           ? record.requestedCardIds
               .map((entry) => String(entry || "").trim())
               .filter(Boolean)
-              .slice(0, MAX_AGENT_MODE_REFERENCE_COUNT)
+              .slice(0, record.modeType === "detail_replacement"
+                ? MAX_DETAIL_REPLACEMENT_REFERENCES
+                : MAX_AGENT_MODE_REFERENCE_COUNT)
           : null,
       } satisfies LocalGenerationPendingState;
     });
@@ -3083,6 +3090,7 @@ export function AgentGenerationWorkspaceDarkV2({
   workflowFeatureSettings = null,
   workflowPromptOptimizationEnabled = true,
   getLatestWorkflowContext,
+  getWorkflowPromptStatus,
   onBack,
   brandStorePanel,
   materialSelectionPanel,
@@ -3380,12 +3388,13 @@ export function AgentGenerationWorkspaceDarkV2({
     }
   );
 
-  const { data: modelsData } = useSWR<{
+  const { data: modelsData, error: modelsError, mutate: refreshModels } = useSWR<{
     models: AgentWorkflowModelOption[];
     defaultModelId?: string | null;
     agentWorkflowConfiguredDefaultModelId?: string | null;
     agentWorkflowDefaultModelId?: string | null;
     agentWorkflowConfiguredModels?: AgentWorkflowModelOption[];
+    detailReplacementModel?: AgentWorkflowModelOption | null;
     agentModel?: any;
   }>("/api/models", fetcher);
 
@@ -3431,17 +3440,6 @@ export function AgentGenerationWorkspaceDarkV2({
   const activeBusinessModeDefaultModelId = !requiresPresetSelection
     ? String(activeBusinessMode?.defaultModelId || "").trim() || null
     : null;
-  const lockedWorkflowModelId =
-    activeBusinessModeDefaultModelId ||
-    selectedAgentPreset?.defaultModelId ||
-    modelsData?.agentWorkflowConfiguredDefaultModelId ||
-    modelsData?.agentWorkflowDefaultModelId ||
-    null;
-  const isWorkflowModelLocked = Boolean(lockedWorkflowModelId);
-  const effectiveDefaultModelId =
-    lockedWorkflowModelId ||
-    modelsData?.defaultModelId ||
-    null;
   const presetDrivenResultModeType: AgentGenerationResultModeType =
     selectedAgentPreset?.type === "image" && presetModeConfig.modeType === "detail_replacement"
       ? detailReplacementMethod === "ai_detail_generate"
@@ -3457,6 +3455,19 @@ export function AgentGenerationWorkspaceDarkV2({
   const currentResultModeType: AgentGenerationResultModeType = requiresPresetSelection
     ? presetDrivenResultModeType
     : businessModeResultModeType;
+  const detailReplacementModel = currentResultModeType === "detail_replacement"
+    ? modelsData?.detailReplacementModel
+    : null;
+  const isDetailReplacementModelLoading = currentResultModeType === "detail_replacement" && !modelsData;
+  const lockedWorkflowModelId =
+    detailReplacementModel?.id ||
+    activeBusinessModeDefaultModelId ||
+    selectedAgentPreset?.defaultModelId ||
+    modelsData?.agentWorkflowConfiguredDefaultModelId ||
+    modelsData?.agentWorkflowDefaultModelId ||
+    null;
+  const isWorkflowModelLocked = Boolean(lockedWorkflowModelId);
+  const effectiveDefaultModelId = lockedWorkflowModelId || modelsData?.defaultModelId || null;
   const isSceneGenerationPreset = currentResultModeType === "scene_generation";
   const isDetailReplacementPreset =
     currentResultModeType === "detail_replacement" ||
@@ -4108,12 +4119,15 @@ export function AgentGenerationWorkspaceDarkV2({
   );
   const executableModelOptions = useMemo(() => {
     const seen = new Set<string>();
-    return [...selectableModels, ...configuredWorkflowModels].filter((model) => {
+    const workflowModels = detailReplacementModel
+      ? [detailReplacementModel, ...configuredWorkflowModels]
+      : configuredWorkflowModels;
+    return [...selectableModels, ...workflowModels].filter((model) => {
       if (seen.has(model.id)) return false;
       seen.add(model.id);
       return true;
     });
-  }, [configuredWorkflowModels, selectableModels]);
+  }, [configuredWorkflowModels, detailReplacementModel, selectableModels]);
   const executableModelIdSet = useMemo(
     () => new Set(executableModelOptions.map((model) => model.id)),
     [executableModelOptions]
@@ -4132,8 +4146,9 @@ export function AgentGenerationWorkspaceDarkV2({
       selectableModels[0],
     [executableModelOptions, lockedWorkflowModel, selectableModels, selectedModelId]
   );
-  const lockedWorkflowModelLabel =
+  const lockedWorkflowModelLabel = detailReplacementModel?.providerName
-    lockedWorkflowModel?.displayName ||
+    ? `${detailReplacementModel.displayName} 「${detailReplacementModel.providerName}」`
+    : lockedWorkflowModel?.displayName ||
     selectedAgentPreset?.defaultModel?.displayName ||
     (lockedWorkflowModelId ? `配置模型不可用（${lockedWorkflowModelId}）` : "未配置");
   const [activeToolStep, setActiveToolStep] = useState<ToolStepKey>("settings");
@@ -4878,6 +4893,14 @@ export function AgentGenerationWorkspaceDarkV2({
     return recoverReplacementRun({ messages, ...pendingGeneration });
   }, [messages, pendingGeneration]);
   const transportIsGenerating = status === "streaming" || status === "submitted";
+  useEffect(() => {
+    const beforeRefresh = (event: Event) => {
+      if (transportIsGenerating || pendingGeneration)
+        (event as CustomEvent<PageRefreshRequest>).detail.block("当前生图任务仍在处理中，请等待结果返回后再刷新。原任务无需重新提交。");
+    };
+    window.addEventListener(BEFORE_PAGE_REFRESH, beforeRefresh);
+    return () => window.removeEventListener(BEFORE_PAGE_REFRESH, beforeRefresh);
+  }, [transportIsGenerating, pendingGeneration]);
   const pendingGenerationProgressCount = useMemo(() => {
     if (!pendingGeneration) {
       return 0;
@@ -6304,10 +6327,24 @@ export function AgentGenerationWorkspaceDarkV2({
       toast.error(`请先查询并选择${detailReferenceSourceLabel}参考图`);
       return;
     }
+    if (isDetailReplacementModelLoading) {
+      if (modelsError) {
+        toast.error("详情替换模型加载失败，正在重新读取");
+        void refreshModels().catch(() => {});
+      } else {
+        toast.info("正在读取详情替换模型，请稍候");
+      }
+      return;
+    }
     if (isSkuReplacementPreset && skuReplacementReferenceCards.length === 0) {
       toast.error(`请先查询并选择${skuReferenceSourceLabel}参考图`);
       return;
     }
+    const promptStatus = getWorkflowPromptStatus?.();
+    if (promptStatus === "loading" || promptStatus === "error") {
+      toast.error(promptStatus === "error" ? "请先在风格模板区重试加载提示词" : "正在加载所选模板的提示词，请稍候");
+      return;
+    }
     const resolvedWorkflowContext = getLatestWorkflowContext?.() ?? workflowContext;
     if (
       isDetailReplacementPreset &&
@@ -6366,6 +6403,10 @@ export function AgentGenerationWorkspaceDarkV2({
     }
     if (replacementModeType === "detail_replacement") {
       if (detailBatchSubmittingRef.current) return;
+      if (replacementExecutionCards.length > MAX_DETAIL_REPLACEMENT_REFERENCES) {
+        toast.error(`本次选中了 ${replacementExecutionCards.length} 张详情参考图，一次最多替换 ${MAX_DETAIL_REPLACEMENT_REFERENCES} 张，请减少本次选择后重试`);
+        return;
+      }
       if (!isValidChatUuid(projectId)) {
         toast.error("当前风格化项目尚未保存，请先保存项目后再执行详情替换");
         return;
@@ -6386,13 +6427,14 @@ export function AgentGenerationWorkspaceDarkV2({
           const saved = await onPersistProject?.();
           if (saved === false) throw new Error("项目尚未保存，请重试");
           const requestId = generateUUID();
-          const response = await fetchWithErrorHandlers("/api/agents/detail-replacement/batches", {
+          const response = await fetch("/api/agents/detail-replacement/batches", {
             method: "POST",
             headers: { "Content-Type": "application/json" },
             body: JSON.stringify({
               projectId,
               requestId,
               model: resolvedModelId,
+              expectedModelId: resolvedModelId === "auto" ? undefined : resolvedModelId,
               imageSize: imageParams.imageSize,
               replacementStrategy: detailReplacementStrategy,
               prompt: detailReplacementStrategy === "product_only"
@@ -6416,6 +6458,7 @@ export function AgentGenerationWorkspaceDarkV2({
           });
           const payload = await response.json().catch(() => ({}));
           if (!response.ok || !payload?.task?.id) {
+            if (payload?.code === "DETAIL_REPLACEMENT_MODEL_CHANGED") void refreshModels().catch(() => {});
             throw new Error(payload?.error || "详情替换任务提交失败");
           }
           setPendingGeneration({
@@ -6603,6 +6646,8 @@ export function AgentGenerationWorkspaceDarkV2({
     input,
     isDetailAiGenerationMethod,
     isDetailReplacementPreset,
+    isDetailReplacementModelLoading,
+    modelsError,
     isSelectedBusinessModeUnavailable,
     isSkuReplacementPreset,
     effectiveDefaultModelId,
@@ -6619,6 +6664,7 @@ export function AgentGenerationWorkspaceDarkV2({
     skuResultCards,
     userMessageCount,
     getLatestWorkflowContext,
+    getWorkflowPromptStatus,
     isSceneGenerationPreset,
     workflowContext,
     sceneMessageAttachments,
@@ -6629,6 +6675,7 @@ export function AgentGenerationWorkspaceDarkV2({
     onPersistProject,
     projectId,
     refreshDetailBatch,
+    refreshModels,
   ]);
   const handleStopGeneration = useCallback(() => {
     detailGenerationCancelRef.current = true;
@@ -6793,31 +6840,11 @@ export function AgentGenerationWorkspaceDarkV2({
       toast.error("图片地址无效");
       return;
     }
-
-    const filename = buildDownloadFilename(raw);
     try {
-      const response = await fetch(raw);
+      await downloadOriginalImage({ url: raw, name: buildDownloadFilename(raw) });
-      if (!response.ok) {
+      toast.success("原图已开始下载");
-        throw new Error(`download failed: ${response.status}`);
+    } catch (error) {
-      }
+      toast.error(getCanvasImageDownloadErrorMessage(error));
-      const blob = await response.blob();
-      const blobUrl = window.URL.createObjectURL(blob);
-      const link = document.createElement("a");
-      link.href = blobUrl;
-      link.download = filename;
-      document.body.appendChild(link);
-      link.click();
-      document.body.removeChild(link);
-      window.URL.revokeObjectURL(blobUrl);
-    } catch {
-      const link = document.createElement("a");
-      link.href = raw;
-      link.target = "_blank";
-      link.rel = "noopener noreferrer";
-      document.body.appendChild(link);
-      link.click();
-      document.body.removeChild(link);
-      toast.message("已打开原图，可右键另存为");
     }
   }, []);
   const uploadBase64ResultToStorage = useCallback(async (base64Url: string) => {
@@ -7812,6 +7839,11 @@ export function AgentGenerationWorkspaceDarkV2({
       toast.error(detailGenerationValidationIssues[0] || "请先补齐 AI详情生成参数");
       return;
     }
+    const promptStatus = getWorkflowPromptStatus?.();
+    if (promptStatus === "loading" || promptStatus === "error") {
+      toast.error(promptStatus === "error" ? "请先在风格模板区重试加载提示词" : "正在加载所选模板的提示词，请稍候");
+      return;
+    }
 
     const productAttachments = detailGenerationProductSlotIndexes.map((index) =>
       detailGenerationSlots[index]
@@ -9416,9 +9448,11 @@ export function AgentGenerationWorkspaceDarkV2({
                         </Select>
                       ) : (
                         <div className="rounded-[24px] border border-white/10 bg-black/30 px-4 py-3 text-sm text-white/70">
-                          {isWorkflowModelLocked ? "后台已锁定生图模型：" : "当前生图模式使用默认模型："}
+                          {isDetailReplacementModelLoading
+                            ? modelsError ? "详情替换模型加载失败，点击批量替换可重试" : "正在读取详情替换模型"
+                            : isWorkflowModelLocked ? "后台已锁定生图模型：" : "当前生图模式使用默认模型："}
                           <span className="ml-2 font-medium text-white">
-                            {isWorkflowModelLocked
+                            {isDetailReplacementModelLoading ? null : isWorkflowModelLocked
                               ? lockedWorkflowModelLabel
                               : currentModel?.displayName || "自动选择"}
                           </span>

components/agents/AgentGenerationWorkspaceNew.tsx

@@ -1,4 +1,5 @@
 "use client";
+import { downloadOriginalImage, getCanvasImageDownloadErrorMessage } from "@/lib/client/canvas-image-download";
 
 import { useChat } from "@ai-sdk/react";
 import { DefaultChatTransport } from "ai";
@@ -725,30 +726,11 @@ export function AgentGenerationWorkspaceNew({
       toast.error("图片地址无效");
       return;
     }
-    const filename = buildDownloadFilename(raw);
     try {
-      const response = await fetch(raw);
+      await downloadOriginalImage({ url: raw, name: buildDownloadFilename(raw) });
-      if (!response.ok) {
+      toast.success("原图已开始下载");
-        throw new Error(`download failed: ${response.status}`);
+    } catch (error) {
-      }
+      toast.error(getCanvasImageDownloadErrorMessage(error));
-      const blob = await response.blob();
-      const blobUrl = window.URL.createObjectURL(blob);
-      const link = document.createElement("a");
-      link.href = blobUrl;
-      link.download = filename;
-      document.body.appendChild(link);
-      link.click();
-      document.body.removeChild(link);
-      window.URL.revokeObjectURL(blobUrl);
-    } catch {
-      const link = document.createElement("a");
-      link.href = raw;
-      link.target = "_blank";
-      link.rel = "noopener noreferrer";
-      document.body.appendChild(link);
-      link.click();
-      document.body.removeChild(link);
-      toast.message("已打开原图，可右键另存为");
     }
   }, []);
 

components/app-update-notice.tsx

@@ -0,0 +1,76 @@
+"use client";
+
+import { useEffect, useState } from "react";
+import { Button } from "@/components/ui/button";
+import { AlertDialog, AlertDialogContent, AlertDialogHeader, AlertDialogTitle, AlertDialogDescription, AlertDialogFooter } from "@/components/ui/alert-dialog";
+import { preparePageRefresh } from "@/lib/client/page-refresh";
+
+export function AppUpdateNotice() {
+  const [availableVersion, setAvailableVersion] = useState("");
+  const [refreshing, setRefreshing] = useState(false);
+  const [error, setError] = useState("");
+  useEffect(() => {
+    let disposed = false;
+    let controller: AbortController | undefined;
+    let checking = false;
+    const check = async () => {
+      if (disposed || checking || document.visibilityState !== "visible") return;
+      checking = true;
+      controller = new AbortController();
+      const current = controller;
+      const timeout = window.setTimeout(() => current.abort(), 8000);
+      try {
+        const response = await fetch("/api/app-version", { cache: "no-store", signal: current.signal });
+        if (!response.ok) return;
+        const data = await response.json();
+        if (!disposed && !current.signal.aborted && typeof data.version === "string" && data.version)
+          setAvailableVersion(data.version !== (process.env.NEXT_PUBLIC_APP_RELEASE || "development") ? data.version : "");
+      } catch {
+        // A failed version read leaves the current workspace available.
+      } finally {
+        window.clearTimeout(timeout);
+        checking = false;
+      }
+    };
+    void check();
+    const interval = window.setInterval(check, 60_000);
+    window.addEventListener("focus", check);
+    window.addEventListener("online", check);
+    document.addEventListener("visibilitychange", check);
+    return () => {
+      disposed = true;
+      controller?.abort();
+      clearInterval(interval);
+      window.removeEventListener("focus", check);
+      window.removeEventListener("online", check);
+      document.removeEventListener("visibilitychange", check);
+    };
+  }, []);
+
+  const refresh = async () => {
+    if (refreshing) return;
+    setRefreshing(true);
+    setError("");
+    try {
+      await preparePageRefresh();
+      window.location.reload();
+      setRefreshing(false);
+    } catch (cause) {
+      setError(cause instanceof Error ? cause.message : "当前内容同步失败，请保留此页并重试。");
+      setRefreshing(false);
+    }
+  };
+  return <AlertDialog open={Boolean(availableVersion)}>
+    <AlertDialogContent className="z-[10001]" overlayClassName="z-[10000]" onEscapeKeyDown={event => event.preventDefault()}>
+      <AlertDialogHeader>
+        <AlertDialogTitle>平台已更新</AlertDialogTitle>
+        <AlertDialogDescription>需要刷新页面后继续使用。点击后会先同步当前画布并保留输入；正在处理的任务完成后再刷新。</AlertDialogDescription>
+      </AlertDialogHeader>
+      {error ? <p role="alert" className="text-sm text-destructive">{error}</p> : null}
+      <AlertDialogFooter>
+        {error ? <Button variant="outline" disabled={refreshing} onClick={() => { setAvailableVersion(""); setError(""); }}>返回处理</Button> : null}
+        <Button disabled={refreshing} onClick={() => void refresh()}>{refreshing ? "正在同步内容…" : "同步并刷新"}</Button>
+      </AlertDialogFooter>
+    </AlertDialogContent>
+  </AlertDialog>;
+}

components/canvas/CanvasChatPanel.tsx

@@ -2,9 +2,13 @@
 
 import { advancePastAtomicRanges, scanMarkdownImageStreaming } from "@/lib/canvas/markdown-image-streaming";
 import { useChat } from "@ai-sdk/react";
+import { useStickToBottom } from "use-stick-to-bottom";
 import { DefaultChatTransport } from "ai";
 import { shouldUseCanvasAgentRuntime } from "@/lib/ai/canvas-agent-runtime/routing";
 import { CanvasAgentProgressMessage } from "@/components/canvas/chat-panel/canvas-agent-progress";
+import { useCanvasRemoteOperation, useCanvasRemoteSnapshot } from "@/components/canvas/CanvasRemoteOperationContext";
+import { readCanvasComposerDraft, writeCanvasComposerDraft, clearCanvasComposerDraft } from "@/lib/client/canvas-draft";
+import { BEFORE_PAGE_REFRESH, type PageRefreshRequest } from "@/lib/client/page-refresh";
 import { canvasHistoryForChat } from "@/lib/client/canvas-history-response";
 import { useCanvasAgentRun } from "@/components/canvas/chat-panel/use-canvas-agent-run";
 import { canvasAgentProgress, type CanvasAgentProgress } from "@/lib/ai/canvas-agent-runtime/progress";
@@ -67,6 +71,7 @@ import { toast } from "sonner";
 import { useCanvasStore } from "@/store/canvas";
 import { cn } from "@/lib/utils";
 import { getGatewayErrorPageMessage } from "@/lib/request-error";
+import { findImageGenerationFailure } from "@/lib/canvas/image-generation-status";
 import { fetcher, fetchWithErrorHandlers, generateUUID } from "@/lib/utils";
 import {
   fetchUploadWithRetry,
@@ -81,7 +86,8 @@ import { canvasService } from "@/services/canvas";
 import {
   inferOriginalImageUrl,
 } from "@/lib/image-url";
-import { buildImageProxyUrl } from "@/lib/image-delivery";
+import { buildImageFallbackUrl, buildImageProxyUrl } from "@/lib/image-delivery";
+import { ProgressiveImagePreview, type LoadedImagePreview } from "@/components/progressive-image-preview";
 import {
   isImageGenerationModelDescriptor,
   isVideoModelDescriptor,
@@ -3241,6 +3247,8 @@ export function CanvasChatPanel({
   onRequireLogin,
   onBeforeAgentRequest,
 }: CanvasChatPanelProps) {
+  const runCanvasRemoteOperation = useCanvasRemoteOperation();
+  const applyCanvasRemoteSnapshot = useCanvasRemoteSnapshot();
   const isWorkspacePresentation = presentation === "workspace";
   const isVideoWorkspace = workspaceVariant === "video";
   const propCanvasToolbarConfig = useMemo(
@@ -3339,6 +3347,7 @@ export function CanvasChatPanel({
   const activeChatIdRef = useRef<string>(requestedChatSessionId || chatId);
   const activeMessagesRef = useRef<ChatMessage[]>([]);
   const inFlightChatIdRef = useRef<string | null>(null);
+  const imageGenerationUserMessageIdsRef = useRef<Record<string, string>>({});
   const inFlightRawChatIdRef = useRef<string | null>(null);
   const [chatSessions, setChatSessions] = useState<CanvasChatSession[]>([]);
   const [isSessionMenuOpen, setIsSessionMenuOpen] = useState(false);
@@ -3360,15 +3369,15 @@ export function CanvasChatPanel({
   const latestCanvasSkillTagsRef = useRef<CanvasSkillTag[]>([]);
   const pendingCanvasSkillTagOrderSaveRef = useRef<string[] | null>(null);
   const suppressSkillTagClickRef = useRef(false);
-  const [messageViewportKey, setMessageViewportKey] = useState(0);
+  const { scrollRef: messagesScrollRef, contentRef: messagesContentRef, scrollToBottom: scrollMessagesToBottom, isAtBottom: isMessageListAtBottom } = useStickToBottom({ initial: false, resize: "instant" });
-  const messagesEndRef = useRef<HTMLDivElement>(null);
+  const initialScrollChatRef = useRef<string | null>(null);
   const fileInputRef = useRef<HTMLInputElement>(null);
   const clawdFolderInputRef = useRef<HTMLInputElement | null>(null);
   const videoSlotInputRefs = useRef<Array<HTMLInputElement | null>>([]);
   const agentSlotInputRefs = useRef<Array<HTMLInputElement | null>>([]);
   const detailSlotInputRefs = useRef<Array<HTMLInputElement | null>>([]);
   const [clawdTableFiles, setClawdTableFiles] = useState<File[]>([]);
-  const textareaRef = useRef<HTMLTextAreaElement>(null);
+  const textareaRef = useRef<HTMLTextAreaElement | null>(null);
   const detailModeSwitchRef = useRef(false);
   const hiddenPromptRef = useRef<string | null>(null);
   const autoContextRef = useRef<string | null>(null);
@@ -3397,7 +3406,6 @@ export function CanvasChatPanel({
   const hasInitializedVideoWorkspaceRef = useRef(false);
   const sessionMenuRef = useRef<HTMLDivElement>(null);
   const clawdHistoryMenuRef = useRef<HTMLDivElement>(null);
-  const historyScrollTimerRef = useRef<ReturnType<typeof setTimeout> | null>(null);
   const forceHistoryHydrationRef = useRef<string | null>(null);
   const copiedUserMessageRef = useRef<CopiedUserMessagePayload | null>(null);
   const composerUserEditedAtRef = useRef(0);
@@ -3434,6 +3442,7 @@ export function CanvasChatPanel({
   const [fullscreenPreview, setFullscreenPreview] = useState<{
     url: string;
     alt?: string;
+    preview: LoadedImagePreview;
   } | null>(null);
   const [downloadProgress, setDownloadProgress] =
     useState<CanvasImageDownloadProgress | null>(null);
@@ -3471,16 +3480,6 @@ export function CanvasChatPanel({
   const [downloadingOriginalUrl, setDownloadingOriginalUrl] = useState("");
   const [addingClawdImageUrl, setAddingClawdImageUrl] = useState("");
   const downloadAbortControllerRef = useRef<AbortController | null>(null);
-  const fullscreenPreviewSrc = useMemo(() => {
-    if (!fullscreenPreview?.url) return "";
-    const originalUrl = inferOriginalImageUrl(fullscreenPreview.url);
-    return buildImageProxyUrl(originalUrl || fullscreenPreview.url, {
-      delivery: "proxy",
-      width: 2400,
-      quality: 90,
-      format: "webp",
-    });
-  }, [fullscreenPreview]);
   useEffect(() => {
     return () => {
       if (composerUploadClearTimeoutRef.current) {
@@ -3650,17 +3649,20 @@ export function CanvasChatPanel({
 
   const setStreamImageGenerationStateForChat = useCallback(
     (chatSessionId: string, next: ImageGenerationStatusStreamPayload | null) => {
+      const userMessageId = imageGenerationUserMessageIdsRef.current[chatSessionId];
+      if (next?.userMessageId && userMessageId && next.userMessageId !== userMessageId) return;
       setStreamImageGenerationStateByChatId((prev) => ({
         ...prev,
-        [chatSessionId]: next,
+        [chatSessionId]: next ? { ...next, userMessageId: next.userMessageId || userMessageId } : null,
       }));
     },
     []
   );
 
-  const clearStreamImageGenerationStateForChat = useCallback((chatSessionId: string) => {
+  const clearStreamImageGenerationStateForChat = useCallback((chatSessionId: string, preserveFailure = false) => {
     setStreamImageGenerationStateByChatId((prev) => {
       if (!(chatSessionId in prev)) return prev;
+      if (preserveFailure && prev[chatSessionId]?.phase === "failed") return prev;
       const next = { ...prev };
       delete next[chatSessionId];
       return next;
@@ -5033,6 +5035,15 @@ export function CanvasChatPanel({
     console.log('[CanvasChat] 已插入图片标签:', url.substring(0, 50));
   }, []);
 
+  const setComposerEditorRef = useCallback((editor: HTMLDivElement | null) => {
+    textareaRef.current = editor as unknown as HTMLTextAreaElement;
+    if (!editor) return;
+    const draft = readCanvasComposerDraft<PickedObjectAttachment>(activeChatId);
+    const text = activeChatIdRef.current === activeChatId ? inputRef.current || draft?.text : draft?.text;
+    if (text) editor.textContent = text;
+    draft?.attachments.forEach((attachment, index) => insertImageTagInEditor(attachment.url, attachment.name || "参考图片", index));
+  }, [activeChatId, insertImageTagInEditor]);
+
   const handleCopyUserMessage = useCallback(async (message: ChatMessage) => {
     const payload = getUserMessageCopyPayload(message);
     if (!payload.text && payload.attachments.length === 0) {
@@ -6097,7 +6108,7 @@ export function CanvasChatPanel({
   const activeComposerMode = unifiedImageAgent && (rawComposerMode === "image" || rawComposerMode === "video")
     ? "agent" : rawComposerMode;
   const isImageAgentComposer = unifiedImageAgent && activeComposerMode === "agent";
-  const [imageAgentEnabled, setImageAgentEnabled] = useState(false);
+  const [imageAgentEnabled, setImageAgentEnabled] = useState(true);
   const imageAgentEnabledRef = useRef(imageAgentEnabled);
   imageAgentEnabledRef.current = imageAgentEnabled;
   const isVideoToolbarDark = isVideoWorkspace || activeComposerMode === "video";
@@ -7980,8 +7991,12 @@ export function CanvasChatPanel({
 
         const store = useCanvasStore.getState();
         store.markAgentOperationRefresh();
+        if (applyCanvasRemoteSnapshot) {
+          if (!applyCanvasRemoteSnapshot({ projectId: targetProjectId, canvasData: result.data.canvasData, updatedAt: String(result.data.updatedAt || "") })) return false;
+        } else {
           store.loadCanvas(result.data.canvasData);
           store.setCanvasRevision(String(result.data.updatedAt || ""), String(result.data.updatedAt || ""));
+        }
         if (createdNodeIds.length > 0) {
           const refreshedStore = useCanvasStore.getState();
           refreshedStore.selectNodes(createdNodeIds);
@@ -8009,7 +8024,7 @@ export function CanvasChatPanel({
         return false;
       }
     },
-    [applyCanvasViewOperation, canvasId, focusCanvasOnNode, mutate]
+    [applyCanvasRemoteSnapshot, applyCanvasViewOperation, canvasId, focusCanvasOnNode, mutate]
   );
   
   const {
@@ -8026,6 +8041,8 @@ export function CanvasChatPanel({
       api: "/api/chat",
       fetch: fetchWithErrorHandlers,
       async prepareSendMessagesRequest(request) {
+        const userMessageId = request.messages.findLast((item) => item.role === "user")?.id;
+        if (userMessageId) imageGenerationUserMessageIdsRef.current[request.id] = userMessageId;
         // 从 canvas-{uuid} 格式中提取纯 UUID，后端 schema 要求纯 UUID
         const rawId = request.id.startsWith('canvas-') 
           ? request.id.replace('canvas-', '') 
@@ -8138,20 +8155,27 @@ export function CanvasChatPanel({
           const payload: ImageGenerationStatusStreamPayload =
             typeof dataPart.data === "string" ? JSON.parse(dataPart.data) : dataPart.data;
           if (!payload || typeof payload !== "object") return;
+          const userMessageId = imageGenerationUserMessageIdsRef.current[eventChatId];
+          if (payload.userMessageId && userMessageId && payload.userMessageId !== userMessageId) return;
           if (payload.phase === "completed") {
             setStreamImageGenerationStateForChat(eventChatId, {
               phase: "finalizing",
+              userMessageId: payload.userMessageId,
               providerType: payload.providerType,
               modelName: getAgentSafeModelName(payload.modelName),
               imageCount: Number(payload.imageCount || 0) || undefined,
             });
             window.setTimeout(() => {
+              if (payload.userMessageId && imageGenerationUserMessageIdsRef.current[eventChatId] !== payload.userMessageId) return;
               clearStreamImageGenerationStateForChat(eventChatId);
             }, 30_000);
             return;
           }
           setStreamImageGenerationStateForChat(eventChatId, {
             phase: payload.phase || "processing",
+            userMessageId: payload.userMessageId,
+            requestId: payload.requestId,
+            failure: payload.failure,
             providerType: payload.providerType,
             modelName: getAgentSafeModelName(payload.modelName),
             imageCount: Number(payload.imageCount || 0) || undefined,
@@ -8419,6 +8443,11 @@ export function CanvasChatPanel({
               )
             : false;
           const normalizedParts = Array.isArray(messageData.parts) ? messageData.parts : [];
+          const failureStatus = findImageGenerationFailure(
+            [{ role: messageData.role, parts: normalizedParts }],
+            imageGenerationUserMessageIdsRef.current[eventChatId],
+          );
+          if (failureStatus) setStreamImageGenerationStateForChat(eventChatId, failureStatus);
           const normalizedAttachments = Array.isArray(messageData.attachments)
             ? messageData.attachments
             : [];
@@ -8487,7 +8516,7 @@ export function CanvasChatPanel({
             (hasImageGenEndMarker || incomingImageUrls.length > 0 || incomingVideoUrls.length > 0) &&
             !shouldDeferClearForActiveMedia
           ) {
-            clearStreamImageGenerationStateForChat(eventChatId);
+            clearStreamImageGenerationStateForChat(eventChatId, true);
           }
 
           if (!isEventForActiveChat) {
@@ -8813,12 +8842,6 @@ export function CanvasChatPanel({
         hasHydratedHistoryRef.current = true;
 
         setMessages(sortCanvasMessagesByCreatedAt(dbMessages));
-
-        if (dbMessages.length > 0) {
-          requestAnimationFrame(() => {
-            messagesEndRef.current?.scrollIntoView({ behavior: "auto", block: "end" });
-          });
-        }
       };
 
       const reloadMessagesOnce = async () => {
@@ -8931,7 +8954,7 @@ export function CanvasChatPanel({
     onRunChange: (run) => {
       // The live stream owns its message; polling only recovers disconnected replies.
       if (status === "submitted" || status === "streaming") return;
-      if (!run?.assistantMessageId || !run.assistantText || run.chatId !== activeChatIdRef.current) return;
+      if (!run?.assistantMessageId || !run.assistantText || run.chatId !== toRawCanvasChatId(activeChatIdRef.current)) return;
       // Recover the same assistant reply after a stream disconnect or refresh.
       setMessages(current => {
         const index = current.findIndex(message => message.id === run.assistantMessageId);
@@ -8946,6 +8969,33 @@ export function CanvasChatPanel({
   });
   const activeCanvasAgentRun = canvasAgentTask.run;
   const isCanvasAgentRunning = activeCanvasAgentRun?.status === "running";
+  useEffect(() => {
+    const beforeRefresh = (event: Event) => {
+      const request = (event as CustomEvent<PageRefreshRequest>).detail;
+      if (composerUploadProgress) {
+        request.block("素材仍在上传，请等待上传完成后再刷新。当前页面和输入已保留。");
+        return;
+      }
+      if (isCanvasAgentRunning || isClawdSubmitting || isDetailGenerating || status === "streaming" || status === "submitted" || Object.values(sendGuardRef.current).some(guard => guard.inFlight)) {
+        request.block("当前对话任务仍在处理中，请等待结果返回后再刷新。原任务会继续执行，无需重新提交。");
+        return;
+      }
+      request.save(async () => {
+        if ((input.trim() || attachments.length) && !writeCanvasComposerDraft(activeChatId, { text: input, attachments }))
+          throw new Error("浏览器无法保存当前输入，请保留此页并检查浏览器存储空间后重试。");
+      });
+    };
+    const beforeUnload = (event: BeforeUnloadEvent) => {
+      event.preventDefault();
+      event.returnValue = "true";
+    };
+    window.addEventListener(BEFORE_PAGE_REFRESH, beforeRefresh);
+    if (composerUploadProgress) window.addEventListener("beforeunload", beforeUnload);
+    return () => {
+      window.removeEventListener(BEFORE_PAGE_REFRESH, beforeRefresh);
+      window.removeEventListener("beforeunload", beforeUnload);
+    };
+  }, [activeChatId, input, attachments, composerUploadProgress, isCanvasAgentRunning, isClawdSubmitting, isDetailGenerating, status]);
 
   const restorePendingClawdRequestToComposer = useCallback(
     (snapshot: PendingClawdRequestRestoreSnapshot) => {
@@ -9089,6 +9139,7 @@ export function CanvasChatPanel({
       },
     } as ChatMessage;
 
+    void scrollMessagesToBottom({ animation: "instant" });
     sendMessage(launchUserMessage as any);
     setMessages((previousMessages) =>
       sortCanvasMessagesByCreatedAt([
@@ -9108,7 +9159,7 @@ export function CanvasChatPanel({
     if (editableDiv) {
       editableDiv.innerHTML = "";
     }
-  }, [activeChatId, rawChatId, selectedModelId, status, sendMessage, setMessages, clearSelection, launchAutoSendTick, activeComposerMode]);
+  }, [activeChatId, rawChatId, selectedModelId, status, sendMessage, setMessages, clearSelection, launchAutoSendTick, activeComposerMode, scrollMessagesToBottom]);
   
   // 当历史消息加载完成后，更新消息列表（支持同一会话的增量刷新）
   const loadedHistorySignatureRef = useRef<string>("");
@@ -9128,7 +9179,6 @@ export function CanvasChatPanel({
     hiddenPromptRef.current = null;
     autoContextRef.current = null;
     pendingLaunchRef.current = null;
-    setMessageViewportKey((prev) => prev + 1);
     setMessages([]);
     setInput("");
     setAttachments([]);
@@ -9143,11 +9193,20 @@ export function CanvasChatPanel({
   }, [activeChatId, setMessages]);
 
   useEffect(() => {
-    if (historyScrollTimerRef.current) {
+    const draft = readCanvasComposerDraft<PickedObjectAttachment>(activeChatId);
-      clearTimeout(historyScrollTimerRef.current);
+    if (!draft || (input && input !== draft.text)) return;
-      historyScrollTimerRef.current = null;
+    if (!input) setInput(draft.text);
-    }
+    setAttachments(draft.attachments);
+    const frame = requestAnimationFrame(() => {
+      const editor = textareaRef.current as HTMLDivElement | null;
+      if (!editor || getComposerPlainTextFromElement(editor).trim()) return;
+      editor.textContent = draft.text;
+      draft.attachments.forEach((attachment, index) => insertImageTagInEditor(attachment.url, attachment.name || "参考图片", index));
+    });
+    return () => cancelAnimationFrame(frame);
+  }, [activeChatId, activeComposerMode, input, insertImageTagInEditor]);
 
+  useEffect(() => {
     if (!historyData || !rawChatId) return;
     const historyMessages = historyData.messages || [];
     const isClawdHistory = isClawdMode || historyMessages.some(isClawdChatMessage);
@@ -9188,29 +9247,14 @@ export function CanvasChatPanel({
         missingPendingMessage ? [...historyMessages, pendingMessage] : historyMessages
       );
     });
-    setMessageViewportKey((prev) => prev + 1);
     console.log("[CanvasChat] 已同步历史消息:", historyMessages.length, signature);
 
-    if (historyMessages.length > 0) {
+
-      requestAnimationFrame(() => {
-        messagesEndRef.current?.scrollIntoView({ behavior: "auto", block: "end" });
-      });
-      historyScrollTimerRef.current = setTimeout(() => {
-        messagesEndRef.current?.scrollIntoView({ behavior: "auto", block: "end" });
-        historyScrollTimerRef.current = null;
-      }, 160);
-      return () => {
-        if (historyScrollTimerRef.current) {
-          clearTimeout(historyScrollTimerRef.current);
-          historyScrollTimerRef.current = null;
-        }
-      };
-    }
   }, [activeChatId, activeClawdRequestUi?.userMessageId, historyData, isClawdMode, isClawdSubmitting, rawChatId, setMessages, status]);
 
   useEffect(() => {
     const streamState = streamImageGenerationStateByChatId[activeChatId];
-    if (!rawChatId || !streamState) return;
+    if (!rawChatId || !streamState || (streamState.phase === "failed" && streamState.failure?.outcome !== "unknown")) return;
 
     let cancelled = false;
     const poll = async () => {
@@ -9234,6 +9278,13 @@ export function CanvasChatPanel({
     const streamState = streamImageGenerationStateByChatId[activeChatId];
     if (!streamState || messages.length === 0) return;
 
+    const failure = findImageGenerationFailure(messages, streamState.userMessageId || "");
+    if (failure && streamState.phase !== "failed") {
+      setStreamImageGenerationStateForChat(activeChatId, failure);
+      return;
+    }
+    if (streamState.phase === "failed" && streamState.failure?.outcome !== "unknown") return;
+
     const lastUserIndex = [...messages]
       .map((message) => message.role)
       .lastIndexOf("user");
@@ -9250,8 +9301,7 @@ export function CanvasChatPanel({
         .join("\n");
       return (
         extractAssistantImageUrls(textContent).length > 0 ||
-        extractVideoUrls(textContent).length > 0 ||
+        extractVideoUrls(textContent).length > 0
-        /失败|超时|重试|error|failed/i.test(textContent)
       );
     });
 
@@ -9272,6 +9322,7 @@ export function CanvasChatPanel({
     messages,
     streamImageGenerationStateByChatId,
     clearStreamImageGenerationStateForChat,
+    setStreamImageGenerationStateForChat,
   ]);
 
   useEffect(() => {
@@ -9778,11 +9829,13 @@ export function CanvasChatPanel({
     });
   }, [activeChatSessionMode, messages, nodes, updateNode]);
 
-  // 滚动到底部
+  // Open each conversation at its latest message; later updates respect manual scrolling.
   useEffect(() => {
     if (messages.length === 0 && !isClawdSubmitting) return;
-    messagesEndRef.current?.scrollIntoView({ behavior: "smooth" });
+    if (initialScrollChatRef.current === activeChatId) return;
-  }, [isClawdSubmitting, messages]);
+    initialScrollChatRef.current = activeChatId;
+    void scrollMessagesToBottom({ animation: "instant" });
+  }, [activeChatId, isClawdSubmitting, messages.length, scrollMessagesToBottom]);
 
   // 标记是否已经为当前画布设置过标题（避免重复调用）
   const hasSetCanvasTitle = useRef(false);
@@ -12551,6 +12604,7 @@ export function CanvasChatPanel({
     const supplement = typeof overrideInput === "string" ? overrideInput.trim() : input.trim();
     if (isCanvasAgentRunning && !isClawdMode && imageAgentEnabled) {
       if (supplement && await canvasAgentTask.control("steer", supplement)) {
+        void scrollMessagesToBottom({ animation: "instant" });
         setInput("");
         const editor = textareaRef.current as HTMLDivElement | null;
         if (editor) editor.innerHTML = "";
@@ -12848,6 +12902,7 @@ export function CanvasChatPanel({
         requestChatId,
         clawdRequestRestoreSnapshot
       );
+      void scrollMessagesToBottom({ animation: "instant" });
       startClawdRequestUi(requestChatId, userMessageId, nextProcessingHint);
       setMessages((previousMessages) =>
         sortCanvasMessagesByCreatedAt([
@@ -13336,6 +13391,26 @@ export function CanvasChatPanel({
     });
     inFlightChatIdRef.current = activeChatId;
     inFlightRawChatIdRef.current = rawChatId;
+    imageGenerationUserMessageIdsRef.current[activeChatId] = userMessageId;
+    if (shouldUseCanvasAgentRuntime({
+      composerMode: effectiveComposerMode,
+      agentPresetId: effectiveAgentEntryMode === "preset" ? selectedAgentPreset?.id : undefined,
+      workspaceVariant: isVideoWorkspace ? "video" : "canvas",
+      contextPayload: contextPayloadRef.current || undefined,
+    }) && onBeforeAgentRequest) {
+      try {
+        if (!(await onBeforeAgentRequest())) throw new Error("画布自动同步失败，本次任务未提交。输入内容已保留，请检查网络后再次发送。");
+      } catch (error) {
+        releaseSendGuard(activeChatId);
+        inFlightChatIdRef.current = null;
+        inFlightRawChatIdRef.current = null;
+        contextPayloadRef.current = null;
+        writeCanvasComposerDraft(activeChatId, { text: composerInput, attachments: effectiveAttachments });
+        toast.error(error instanceof Error ? error.message : "画布自动同步失败，本次任务未提交，输入内容已保留。");
+        return;
+      }
+    }
+    clearCanvasComposerDraft(activeChatId);
     clearStreamImageGenerationStateForChat(activeChatId);
     clearAgentProgressStateForChat(activeChatId);
     if (shouldShowOptimisticImageGeneration) {
@@ -13360,6 +13435,7 @@ export function CanvasChatPanel({
 
     // 使用与 multimodal-input 相同的格式发送消息
     try {
+      void scrollMessagesToBottom({ animation: "instant" });
       sendMessage(optimisticUserMessage as any);
       setMessages((previousMessages) =>
         sortCanvasMessagesByCreatedAt([
@@ -13398,6 +13474,9 @@ export function CanvasChatPanel({
     }
   }, [
     isCanvasAgentRunning,
+    scrollMessagesToBottom,
+    onBeforeAgentRequest,
+    isVideoWorkspace,
     canvasAgentTask.control,
     activeChatId,
     activeComposerMode,
@@ -13535,23 +13614,19 @@ export function CanvasChatPanel({
 
         console.log('[CanvasChat] 更新画布:', rawId);
 
-        const updateResponse = await fetch(`/api/canvas/${rawId}`, {
+        if (!runCanvasRemoteOperation) return;
-          method: 'PUT',
+        await runCanvasRemoteOperation(async () => {
-          headers: { 'Content-Type': 'application/json' },
+          if (useCanvasStore.getState().projectId !== rawId) return;
-          body: JSON.stringify({
+          const result = await canvasService.updateProject(rawId, { title, thumbnail: firstImageUrl });
-            title,
+          if (!result.success) throw new Error(result.error || "画布名称同步失败");
-            thumbnail: firstImageUrl,
-          }),
         });
-
-        console.log('[CanvasChat] 画布更新响应:', updateResponse.status);
       } else {
         console.error('[CanvasChat] auto-title API 请求失败:', response.status);
       }
     } catch (error) {
       console.error('[CanvasChat] 自动命名失败:', error);
     }
-  }, [chatId]);
+  }, [chatId, runCanvasRemoteOperation]);
 
   const addUploadedImageAttachmentToComposer = useCallback(
     (uploaded: ComposerUploadedImage) => {
@@ -15105,7 +15180,7 @@ export function CanvasChatPanel({
       !hasGenerationEnd &&
       Boolean(currentModel || activeComposerMode === "agent"));
   const hasActiveTypewriter = Object.keys(activeTypingSections).length > 0;
-  const shouldRenderImageLoading = shouldShowImageLoading && !hasActiveTypewriter;
+  const shouldRenderImageLoading = shouldShowImageLoading && streamImageGenerationState?.phase !== "failed" && !hasActiveTypewriter;
   const loadingImageCount = streamImageGenerationState?.imageCount || imageParams.imageCount || 1;
   const loadingProviderType =
     streamImageGenerationState?.providerType ||
@@ -15168,9 +15243,9 @@ export function CanvasChatPanel({
       phase === "queued"
         ? "等待开始生成"
         : phase === "finalizing"
-          ? "正在润饰细节"
+          ? "正在保存生成结果"
           : phase === "failed"
-            ? "生成失败"
+            ? streamState.failure?.message || "生成失败"
             : "正在创建图片";
     const status = phase === "failed" ? "failed" : "generating";
     const currentNodes = useCanvasStore.getState().nodes;
@@ -15226,14 +15301,10 @@ export function CanvasChatPanel({
       canvasGenerationPlaceholder: true,
       chatId: activeChatId,
       detailProgressLabel: label,
-      generationProgress:
+      generationProgress: undefined,
-        phase === "queued"
+      generationFailure: streamState.failure,
-          ? 12
+      generationRequestId: streamState.requestId,
-          : phase === "finalizing"
+      generationUserMessageId: streamState.userMessageId,
-            ? 96
-            : phase === "failed"
-              ? 100
-              : undefined,
       modelName: streamState.modelName || currentModel?.displayName || undefined,
       providerType: streamState.providerType || currentModel?.providerType || undefined,
       placementMode: "anchored-generation",
@@ -15327,6 +15398,7 @@ export function CanvasChatPanel({
 
       if (
         message.role === "assistant" &&
+        !rawParts.some((part: any) => part.type === "data-imageGenerationStatus" && part.data?.failure) &&
         isInternalCanvasImageGenerationFailureText(cleanedParts)
       ) {
         return acc;
@@ -15636,7 +15708,7 @@ export function CanvasChatPanel({
         processedMessageIds.current.clear();
         hasHydratedHistoryRef.current = true;
         setMessages(sortCanvasMessagesByCreatedAt(fresh.messages));
-        setMessageViewportKey((previous) => previous + 1);
+        void scrollMessagesToBottom({ animation: "instant" });
       }).catch((error) => {
         console.error("[CanvasChat] Failed to reopen current conversation:", error);
         toast.error("聊天记录暂时读取失败，请重试");
@@ -15650,7 +15722,7 @@ export function CanvasChatPanel({
     replaceChatSessionQuery(sessionId);
     setIsSessionMenuOpen(false);
     toast.success("已切换聊天窗口");
-  }, [activeChatId, isClawdSubmitting, mutateHistoryData, releaseSendGuard, replaceChatSessionQuery, setMessages, status]);
+  }, [activeChatId, isClawdSubmitting, mutateHistoryData, releaseSendGuard, replaceChatSessionQuery, scrollMessagesToBottom, setMessages, status]);
 
   const switchToClawdHistorySession = useCallback(
     (historyItem: ClawdHistoryItem) => {
@@ -15812,8 +15884,8 @@ export function CanvasChatPanel({
                     loading="lazy"
                     decoding="async"
                     onError={(event) => {
-                      if (event.currentTarget.src !== activeClawdSkillTag.iconUrl) {
+                      if (event.currentTarget.src !== buildImageFallbackUrl(activeClawdSkillTag.iconUrl)) {
-                        event.currentTarget.src = activeClawdSkillTag.iconUrl || "";
+                        event.currentTarget.src = buildImageFallbackUrl(activeClawdSkillTag.iconUrl);
                       }
                     }}
                   />
@@ -16067,11 +16139,17 @@ export function CanvasChatPanel({
       {isDetailEmptyState ? (
         <div className="flex-1 min-h-0" />
       ) : (
+      <div key={activeChatId} className="relative flex min-h-0 flex-1 flex-col">
       <div
-        key={`${activeChatId}-${messageViewportKey}`}
+        ref={messagesScrollRef}
+        data-testid="canvas-chat-messages"
+        role="region"
+        aria-label="对话消息"
+        // biome-ignore lint/a11y/noNoninteractiveTabindex: The scroll region needs PageUp/PageDown keyboard input.
+        tabIndex={0}
         className={cn(
-          "flex-1 min-h-0 overflow-x-hidden",
+          "flex-1 min-h-0 focus-visible:outline-none focus-visible:ring-2 focus-visible:ring-inset focus-visible:ring-ring",
-          isPlainCanvasEmptyState ? "overflow-hidden" : "overflow-y-auto",
+          isPlainCanvasEmptyState ? "overflow-hidden" : "overflow-auto",
           isWorkspacePresentation ? "p-5" : "p-3",
           isPlainCanvasEmptyState
             ? "pt-0"
@@ -16080,7 +16158,7 @@ export function CanvasChatPanel({
               : "pt-3"
         )}
       >
-        <div className={cn(
+        <div ref={messagesContentRef} className={cn(
           "space-y-5 overflow-x-hidden pr-1",
           isPlainCanvasEmptyState ? "h-full pb-0" : "pb-24"
         )}>
@@ -16131,8 +16209,8 @@ export function CanvasChatPanel({
                             loading="lazy"
                             decoding="async"
                             onError={(event) => {
-                              if (event.currentTarget.src !== attachment.url) {
+                              if (event.currentTarget.src !== buildImageFallbackUrl(attachment.url)) {
-                                event.currentTarget.src = attachment.url;
+                                event.currentTarget.src = buildImageFallbackUrl(attachment.url);
                               }
                             }}
                           />
@@ -16208,8 +16286,8 @@ export function CanvasChatPanel({
                               loading="lazy"
                               decoding="async"
                               onError={(event) => {
-                                if (event.currentTarget.src !== attachment.url) {
+                                if (event.currentTarget.src !== buildImageFallbackUrl(attachment.url)) {
-                                  event.currentTarget.src = attachment.url;
+                                  event.currentTarget.src = buildImageFallbackUrl(attachment.url);
                                 }
                               }}
                             />
@@ -16394,8 +16472,8 @@ export function CanvasChatPanel({
                                     loading="lazy"
                                     decoding="async"
                                     onError={(event) => {
-                                      if (event.currentTarget.src !== tag.iconUrl) {
+                                      if (event.currentTarget.src !== buildImageFallbackUrl(tag.iconUrl)) {
-                                        event.currentTarget.src = tag.iconUrl || "";
+                                        event.currentTarget.src = buildImageFallbackUrl(tag.iconUrl);
                                       }
                                     }}
                                   />
@@ -16695,8 +16773,8 @@ export function CanvasChatPanel({
                                       loading="lazy"
                                       decoding="async"
                                       onError={(event) => {
-                                        if (event.currentTarget.src !== attachment.url) {
+                                        if (event.currentTarget.src !== buildImageFallbackUrl(attachment.url)) {
-                                          event.currentTarget.src = attachment.url;
+                                          event.currentTarget.src = buildImageFallbackUrl(attachment.url);
                                         }
                                       }}
                                     />
@@ -17032,15 +17110,23 @@ export function CanvasChatPanel({
                                                 loading="lazy"
                                                 decoding="async"
                                                 onError={(event) => {
-                                                  if (event.currentTarget.src !== url) {
+                                                  if (event.currentTarget.src !== buildImageFallbackUrl(url)) {
-                                                    event.currentTarget.src = url;
+                                                    event.currentTarget.src = buildImageFallbackUrl(url);
                                                   }
                                                 }}
-                                                onClick={() => setFullscreenPreview({ url })}
+                                                onClick={(event) => setFullscreenPreview({ url, preview: {
+                                                  src: event.currentTarget.currentSrc || event.currentTarget.src,
+                                                  width: event.currentTarget.naturalWidth,
+                                                  height: event.currentTarget.naturalHeight,
+                                                } })}
                                                 onDoubleClick={(e) => {
                                                   e.preventDefault();
                                                   e.stopPropagation();
-                                                  setFullscreenPreview({ url });
+                                                  setFullscreenPreview({ url, preview: {
+                                                    src: e.currentTarget.currentSrc || e.currentTarget.src,
+                                                    width: e.currentTarget.naturalWidth,
+                                                    height: e.currentTarget.naturalHeight,
+                                                  } });
                                                 }}
                                               />
                                               <div className="absolute bottom-2 right-2 flex items-center gap-1.5">
@@ -17275,9 +17361,22 @@ export function CanvasChatPanel({
             />
           ) : null}
 
-          <div ref={messagesEndRef} />
         </div>
       </div>
+      {!isMessageListAtBottom && renderableVisibleMessages.length > 0 ? (
+        <Button
+          type="button"
+          variant="outline"
+          size="icon"
+          aria-label="回到最新消息"
+          title="回到最新消息"
+          className="absolute bottom-3 left-1/2 z-10 -translate-x-1/2 rounded-full shadow-sm"
+          onClick={() => void scrollMessagesToBottom({ animation: "instant" })}
+        >
+          <ChevronDown className="h-4 w-4" />
+        </Button>
+      ) : null}
+      </div>
       )}
 
       {fullscreenPreview && createPortal(
@@ -17286,7 +17385,7 @@ export function CanvasChatPanel({
           onClick={() => setFullscreenPreview(null)}
         >
           <button
-            className="absolute top-4 right-4 p-2 rounded-full bg-white/10 hover:bg-white/20 transition-colors"
+            className="absolute top-4 right-4 z-10 p-2 rounded-full bg-white/10 hover:bg-white/20 transition-colors"
             onClick={() => setFullscreenPreview(null)}
             aria-label="关闭预览"
           >
@@ -17295,7 +17394,7 @@ export function CanvasChatPanel({
             </svg>
           </button>
           <button
-            className="absolute top-4 right-16 inline-flex items-center gap-1 rounded-full bg-white/10 px-3 py-2 text-sm text-white transition-colors hover:bg-white/20 disabled:cursor-not-allowed disabled:opacity-65"
+            className="absolute top-4 right-16 z-10 inline-flex items-center gap-1 rounded-full bg-white/10 px-3 py-2 text-sm text-white transition-colors hover:bg-white/20 disabled:cursor-not-allowed disabled:opacity-65"
             disabled={isDownloadingOriginalImage}
             onClick={(event) => {
               event.stopPropagation();
@@ -17312,13 +17411,11 @@ export function CanvasChatPanel({
             {isDownloadingOriginalImage ? "下载中" : "下载原图"}
           </button>
 
-          <img
+          <ProgressiveImagePreview
-            src={fullscreenPreviewSrc}
+            src={inferOriginalImageUrl(fullscreenPreview.url) || fullscreenPreview.url}
+            preview={fullscreenPreview.preview}
             alt={fullscreenPreview.alt || "图片预览"}
             className="max-w-[95vw] max-h-[95vh] object-contain"
-            decoding="async"
-            draggable={false}
-            onClick={(e) => e.stopPropagation()}
           />
 
           <div className="absolute bottom-4 left-1/2 -translate-x-1/2 text-white/60 text-sm">
@@ -17885,8 +17982,8 @@ export function CanvasChatPanel({
                                       loading="lazy"
                                       decoding="async"
                                       onError={(event) => {
-                                        if (event.currentTarget.src !== slotAttachment.url) {
+                                        if (event.currentTarget.src !== buildImageFallbackUrl(slotAttachment.url)) {
-                                          event.currentTarget.src = slotAttachment.url;
+                                          event.currentTarget.src = buildImageFallbackUrl(slotAttachment.url);
                                         }
                                       }}
                                     />
@@ -18210,8 +18307,8 @@ export function CanvasChatPanel({
                       loading="lazy"
                       decoding="async"
                       onError={(event) => {
-                        if (event.currentTarget.src !== activeClawdSkillTag.iconUrl) {
+                        if (event.currentTarget.src !== buildImageFallbackUrl(activeClawdSkillTag.iconUrl)) {
-                          event.currentTarget.src = activeClawdSkillTag.iconUrl || "";
+                          event.currentTarget.src = buildImageFallbackUrl(activeClawdSkillTag.iconUrl);
                         }
                       }}
                     />
@@ -18470,8 +18567,8 @@ export function CanvasChatPanel({
                             loading="lazy"
                             decoding="async"
                             onError={(event) => {
-                              if (event.currentTarget.src !== item.url) {
+                              if (event.currentTarget.src !== buildImageFallbackUrl(item.url)) {
-                                event.currentTarget.src = item.url;
+                                event.currentTarget.src = buildImageFallbackUrl(item.url);
                               }
                             }}
                           />
@@ -18526,7 +18623,7 @@ export function CanvasChatPanel({
               )}
             >
               <div
-                ref={textareaRef as any}
+                ref={setComposerEditorRef}
                 contentEditable={!isSubmitting || (isCanvasAgentRunning && !canvasAgentTask.stopPending)}
                 role="textbox"
                 tabIndex={isSubmitting ? -1 : 0}
@@ -18560,6 +18657,7 @@ export function CanvasChatPanel({
                   setTagPreview(null);
                 }}
                 onInput={(e) => {
+                  clearCanvasComposerDraft(activeChatId);
                   // 从 contenteditable 中提取纯文本（排除附件标签文本）
                   const target = e.target as HTMLDivElement;
                   const clone = target.cloneNode(true) as HTMLDivElement;
@@ -18655,8 +18753,8 @@ export function CanvasChatPanel({
                             loading="lazy"
                             decoding="async"
                             onError={(event) => {
-                              if (event.currentTarget.src !== slotAttachment.url) {
+                              if (event.currentTarget.src !== buildImageFallbackUrl(slotAttachment.url)) {
-                                event.currentTarget.src = slotAttachment.url;
+                                event.currentTarget.src = buildImageFallbackUrl(slotAttachment.url);
                               }
                             }}
                           />
@@ -18723,8 +18821,8 @@ export function CanvasChatPanel({
                             loading="lazy"
                             decoding="async"
                             onError={(event) => {
-                              if (event.currentTarget.src !== slotAttachment.url) {
+                              if (event.currentTarget.src !== buildImageFallbackUrl(slotAttachment.url)) {
-                                event.currentTarget.src = slotAttachment.url;
+                                event.currentTarget.src = buildImageFallbackUrl(slotAttachment.url);
                               }
                             }}
                           />
@@ -19423,8 +19521,8 @@ export function CanvasChatPanel({
                   loading="lazy"
                   decoding="async"
                   onError={(event) => {
-                    if (event.currentTarget.src !== tagPreview.url) {
+                    if (event.currentTarget.src !== buildImageFallbackUrl(tagPreview.url)) {
-                      event.currentTarget.src = tagPreview.url;
+                      event.currentTarget.src = buildImageFallbackUrl(tagPreview.url);
                     }
                   }}
                 />

components/canvas/CanvasFileListPanel.tsx

@@ -19,6 +19,7 @@ const PROJECT_LIST_PAGE_SIZE = 24;
 interface CanvasFileListPanelProps {
   currentId: string;
   onClose: () => void;
+  onNavigate?: (url: string) => void;
   workspaceType?: CanvasWorkspaceType;
   workspaceLabel?: string;
   createUrl?: string;
@@ -28,6 +29,7 @@ interface CanvasFileListPanelProps {
 export function CanvasFileListPanel({
   currentId,
   onClose,
+  onNavigate,
   workspaceType = "canvas",
   workspaceLabel = "画布",
   createUrl = "/canvas?new=1",
@@ -88,6 +90,10 @@ export function CanvasFileListPanel({
 
   // 创建新画布
   const handleCreateNew = async () => {
+    if (onNavigate) {
+      onNavigate(createUrl);
+      return;
+    }
     router.push(createUrl);
   };
 
@@ -100,6 +106,10 @@ export function CanvasFileListPanel({
     }
     const targetUrl = buildProjectUrl(id);
     onClose(); // 关闭文件列表面板
+    if (onNavigate) {
+      onNavigate(targetUrl);
+      return;
+    }
     // 强制整页跳转，避免仅更新 URL 不刷新
     setTimeout(() => {
       window.location.assign(targetUrl);

components/canvas/CanvasRemoteOperationContext.tsx

@@ -1,11 +1,26 @@
 "use client";
 
 import { createContext, useContext } from "react";
+import type { CanvasState } from "@/types/canvas";
+
+export type CanvasRemoteOperationResult = {
+  projectId: string;
+  canvasData: CanvasState;
+  updatedAt: string;
+};
+export type CanvasRemoteOperation = (() => Promise<void>) | (() => Promise<CanvasRemoteOperationResult | undefined>);
 
 export const CanvasRemoteOperationContext = createContext<
-  ((operation: () => Promise<void>) => Promise<void>) | null
+  {
+    run: (operation: CanvasRemoteOperation) => Promise<void>;
+    applySnapshot: (result: CanvasRemoteOperationResult) => boolean;
+  } | null
 >(null);
 
 export function useCanvasRemoteOperation() {
-  return useContext(CanvasRemoteOperationContext);
+  return useContext(CanvasRemoteOperationContext)?.run || null;
+}
+
+export function useCanvasRemoteSnapshot() {
+  return useContext(CanvasRemoteOperationContext)?.applySnapshot || null;
 }

components/canvas/CanvasSurfaceHeader.tsx

@@ -2,14 +2,10 @@
 
 import { ReferenceIcon } from "@/components/lovart/reference-icon";
 
-import { Loader2, Save } from "lucide-react";
-
 type CanvasSurfaceHeaderProps = {
-  isSaving: boolean;
   onAddImage: () => void;
   onHome: () => void;
   onOpenFiles: () => void;
-  onSave: () => void;
   projectTitle: string;
   rightInset: number;
 };
@@ -18,11 +14,9 @@ const iconButtonClass =
   "inline-flex h-[28px] w-[28px] items-center justify-center rounded-[8px] p-0 text-[#858585] transition-colors hover:bg-black/5 focus-visible:outline-2 focus-visible:outline-offset-2 dark:hover:bg-white/10";
 
 export function CanvasSurfaceHeader({
-  isSaving,
   onAddImage,
   onHome,
   onOpenFiles,
-  onSave,
   projectTitle,
   rightInset,
 }: CanvasSurfaceHeaderProps) {
@@ -77,19 +71,6 @@ export function CanvasSurfaceHeader({
           <ReferenceIcon name="plus" size={16} />
         </button>
       </div>
-      <button
-        className="inline-flex h-7 shrink-0 items-center gap-1.5 rounded-[8px] border border-[#e5e5e5] px-3 text-[12px] text-[#333333] transition-colors hover:bg-black/5 disabled:opacity-50 dark:border-white/10 dark:text-white"
-        disabled={isSaving}
-        onClick={onSave}
-        type="button"
-      >
-        {isSaving ? (
-          <Loader2 className="h-3.5 w-3.5 animate-spin" />
-        ) : (
-          <Save className="h-3.5 w-3.5" />
-        )}
-        保存
-      </button>
     </div>
   );
 }

components/canvas/chat-panel/canvas-agent-stream.ts

@@ -152,16 +152,7 @@ export function shouldRetryCanvasViewOperationAfterRefresh(
   );
 }
 
-export type ImageGenerationStatusStreamPayload = {
+export type { ImageGenerationStatusStreamPayload } from "@/lib/canvas/image-generation-status";
-  phase?: "queued" | "processing" | "finalizing" | "failed" | "completed";
-  providerType?: string;
-  modelName?: string;
-  imageCount?: number;
-  queuePosition?: number;
-  sameModelRunningCount?: number;
-  concurrencyLimit?: number;
-  estimatedWaitMs?: number;
-};
 
 export type AgentTargetLockRefPreview = {
   url: string;

components/canvas/chat-panel/canvas-chat-media.ts

@@ -448,7 +448,7 @@ function extractChatMediaUrls(text: string, kind: ChatMediaKind): string[] {
     }
   }
 
-  const markdownLinkPattern = /\[([^\]]*)]\((https?:\/\/[^)\s]+)\)/gi;
+  const markdownLinkPattern = /(?<!!)\[([^\]]*)]\((https?:\/\/[^)\s]+)\)/gi;
   while ((match = markdownLinkPattern.exec(text)) !== null) {
     const label = String(match[1] || "");
     const hintedKind = /音频|语音|声音|audio|mp3/i.test(label)
@@ -491,7 +491,7 @@ export function stripMediaMarkup(text: string): string {
     .replace(/<audio[\s\S]*?<\/audio>/gi, "")
     .replace(/<audio\b[^>]*\/?\s*>/gi, "")
     .replace(/<a[\s\S]*?<\/a>/gi, "")
-    .replace(/\[([^\]]*)]\((https?:\/\/[^)\s]+)\)/gi, (match, label, url) => {
+    .replace(/(?<!!)\[([^\]]*)]\((https?:\/\/[^)\s]+)\)/gi, (match, label, url) => {
       const hintedMedia = /音频|语音|声音|audio|mp3|视频|影片|播放|video/i.test(
         String(label || "")
       );

components/canvas/chat-panel/video-canvas-agent-panel.tsx

@@ -6,6 +6,8 @@ import { ArrowUp, MessageSquare, X } from "lucide-react";
 import { useCallback, useEffect, useRef, useState } from "react";
 import { toast } from "sonner";
 import { CanvasAgentRunPanel } from "./canvas-agent-run-panel";
+import { BEFORE_PAGE_REFRESH, type PageRefreshRequest } from "@/lib/client/page-refresh";
+import { readCanvasComposerDraft, writeCanvasComposerDraft, clearCanvasComposerDraft } from "@/lib/client/canvas-draft";
 import {
   videoAgentSettingsSchema,
   type VideoAgentSettings,
@@ -94,6 +96,22 @@ export function VideoCanvasAgentPanel(props: {
     };
   }, [props.projectId, setMessages]);
   const busy = backgroundRunning || preparing || status === "submitted" || status === "streaming";
+  useEffect(() => {
+    const draft = readCanvasComposerDraft(`video-agent-${props.projectId}`);
+    if (draft) setInput(draft.text);
+  }, [props.projectId]);
+  useEffect(() => {
+    const beforeRefresh = (event: Event) => {
+      const request = (event as CustomEvent<PageRefreshRequest>).detail;
+      if (busy) request.block("当前视频任务仍在处理中，请等待结果返回后再刷新。原任务无需重新提交。");
+      request.save(async () => {
+        if (input.trim() && !writeCanvasComposerDraft(`video-agent-${props.projectId}`, { text: input, attachments: [] }))
+          throw new Error("浏览器无法保存当前输入，请保留此页并检查浏览器存储空间后重试。");
+      });
+    };
+    window.addEventListener(BEFORE_PAGE_REFRESH, beforeRefresh);
+    return () => window.removeEventListener(BEFORE_PAGE_REFRESH, beforeRefresh);
+  }, [busy, input, props.projectId]);
   const submit = useCallback(
     async (resumeRunId?: string) => {
       if (busy || loading) return;
@@ -105,6 +123,7 @@ export function VideoCanvasAgentPanel(props: {
       try {
         await latest.current.props.beforeSend();
         if (!mounted.current) return;
+        clearCanvasComposerDraft(`video-agent-${props.projectId}`);
         resumeRef.current = resumeRunId;
         setInput("");
         await sendMessage({ text });
@@ -298,7 +317,7 @@ export function VideoCanvasAgentPanel(props: {
           <textarea
             aria-label="视频创作要求"
             value={input}
-            onChange={(event) => setInput(event.target.value)}
+            onChange={(event) => { clearCanvasComposerDraft(`video-agent-${props.projectId}`); setInput(event.target.value); }}
             maxLength={2000}
             rows={3}
             placeholder="例如：先分析选中素材，写分镜，再生成一条5秒商品展示视频"

components/canvas/nodes/ImageNode.tsx

@@ -1,4 +1,6 @@
 "use client";
+import { CanvasPreviewImage } from "./image-node/canvas-preview-image";
+import { canvasImagePreviewWidth } from "@/lib/canvas/image-preview-width";
 import { isRetiredStorageUrl, RETIRED_STORAGE_MESSAGE } from "@/lib/storage/retired-storage";
 
 import {
@@ -60,6 +62,7 @@ import { DetailUiDomRenderer } from "@/components/canvas/DetailUiDomRenderer";
 import { ReferenceImageToolbar } from "@/components/canvas/ReferenceImageToolbar";
 import { CanvasToolbarIcon } from "@/components/canvas/CanvasToolbarIcon";
 import { CanvasImageDownloadProgressDialog } from "@/components/canvas/CanvasImageDownloadProgressDialog";
+import { ProgressiveImagePreview, type LoadedImagePreview } from "@/components/progressive-image-preview";
 import {
   areImageAdjustmentsEqual,
   buildImageAdjustmentFilterStyle,
@@ -186,7 +189,7 @@ import {
   normalizeDetailUiSubjectAnalysis,
 } from "@/lib/detail-ui-subject-analysis";
 import type { DetailUiScreenOverlaySnapshot } from "@/lib/detail-ui-surface-adapter";
-import { buildImageProxyUrl } from "@/lib/image-delivery";
+import { buildImageFallbackUrl, buildImageProxyUrl } from "@/lib/image-delivery";
 import {
   DEFAULT_PUBLIC_THREED_MODEL_ALIAS_CONFIG,
   getDefaultThreeDModelAliasId,
@@ -1711,6 +1714,7 @@ export function ImageNode({
   const [isUploading, setIsUploading] = useState(false);
   const [annotatorOpen, setAnnotatorOpen] = useState(false);
   const [fullscreenPreviewOpen, setFullscreenPreviewOpen] = useState(false);
+  const [fullscreenPreviewImage, setFullscreenPreviewImage] = useState<LoadedImagePreview | null>(null);
   const [downloadProgress, setDownloadProgress] =
     useState<CanvasImageDownloadProgress | null>(null);
   const downloadAbortControllerRef = useRef<AbortController | null>(null);
@@ -2500,13 +2504,13 @@ export function ImageNode({
     const densityMultiplier = shouldUseHighFidelityDisplayImage ? 1.35 : 1.05;
     const minWidth = shouldUseHighFidelityDisplayImage ? 960 : 640;
     const maxWidth = shouldUseHighFidelityDisplayImage ? 4096 : 2600;
-    return Math.max(
+    return canvasImagePreviewWidth(Math.max(
       minWidth,
       Math.min(
         maxWidth,
         Math.round((node.size.width || 320) * zoomMultiplier * devicePixelRatio * densityMultiplier)
       )
-    );
+    ), maxWidth);
   }, [node.size.width, shouldUseHighFidelityDisplayImage, viewportZoom]);
   const displayImageQuality = shouldUseHighFidelityDisplayImage ? 92 : 88;
   const displayImageSrc = useMemo(
@@ -4681,106 +4685,44 @@ export function ImageNode({
       return;
     }
 
-    setIsCreatingDetachedResultNode(true);
+    if (!projectId || !runCanvasRemoteOperation) {
+      toast.error("画布还在加载，请稍后再试");
+      return;
+    }
+
+    setIsCreatingDetachedResultNode(false);
     setIsProcessing(true);
     const actionName = "框选抠图";
-    const newNodeId = addNode({
-      type: "image",
-      position: {
-        x: node.position.x + node.size.width + 20,
-        y: node.position.y,
-      },
-      size: { width: node.size.width, height: node.size.height },
-      data: {
-        src: "",
-        status: "generating",
-        prompt: `${actionName}处理中...`,
-        title: `${displayTitle}-${actionName}`,
-        originalSrc: data.src,
-        metadata: {
-          cropRect: boxCutoutSelection,
-          paddingRatio: BOX_CUTOUT_DEFAULT_PADDING_RATIO,
-        },
-      },
-      connections: [node.id],
-    });
 
     try {
-      const result = await imageGenerationService.boxCutout({
+      const command = createCanvasCapabilityClientCommand({
-        imageUrl: data.src,
+        capabilityId: "image.box_cutout",
-        cropRect: boxCutoutSelection,
+        nodeIds: [node.id],
+        projectId,
+        source: "toolbar",
+        args: {
+          ...boxCutoutSelection,
           paddingRatio: BOX_CUTOUT_DEFAULT_PADDING_RATIO,
-        sourceNodeId: node.id,
-      });
-
-      if (result.success && result.data?.url) {
-        updateNode(newNodeId, {
-          data: {
-            src: result.data.url,
-            status: "completed",
-            prompt: `${actionName}结果`,
-            title: `${displayTitle}-${actionName}`,
-            originalSrc: data.src,
-            metadata: {
-              cropRect: boxCutoutSelection,
-              cropRectApplied: result.data.cropRectApplied,
-              paddedCropRectApplied: result.data.paddedCropRectApplied,
-              paddingRatio: BOX_CUTOUT_DEFAULT_PADDING_RATIO,
-              editMode: "box-cutout",
-            },
         },
       });
+      await runCanvasRemoteOperation(() => executeCanvasToolbarCapability(command));
       toast.success(`${actionName}完成`);
-      } else {
-        updateNode(newNodeId, {
-          data: {
-            src: "",
-            status: "failed",
-            prompt: `${actionName}失败`,
-            title: `${displayTitle}-${actionName}-失败`,
-            originalSrc: data.src,
-            metadata: {
-              cropRect: boxCutoutSelection,
-              paddingRatio: BOX_CUTOUT_DEFAULT_PADDING_RATIO,
-            },
-          },
-        });
-        toast.error(result.error || `${actionName}失败`);
-      }
     } catch (error) {
       console.error("框选抠图失败:", error);
-      updateNode(newNodeId, {
+      toast.error(error instanceof Error ? error.message : `${actionName}失败`);
-        data: {
-          src: "",
-          status: "failed",
-          prompt: `${actionName}失败`,
-          title: `${displayTitle}-${actionName}-失败`,
-          originalSrc: data.src,
-          metadata: {
-            cropRect: boxCutoutSelection,
-            paddingRatio: BOX_CUTOUT_DEFAULT_PADDING_RATIO,
-          },
-        },
-      });
-      toast.error(`${actionName}失败，请重试`);
     } finally {
       setIsCreatingDetachedResultNode(false);
       setIsProcessing(false);
       resetBoxCutoutState();
     }
   }, [
-    addNode,
     boxCutoutSelection,
     data.src,
-    displayTitle,
     isProcessing,
     node.id,
-    node.position.x,
+    projectId,
-    node.position.y,
-    node.size.height,
-    node.size.width,
     resetBoxCutoutState,
-    updateNode,
+    runCanvasRemoteOperation,
   ]);
 
   const animateAddToChat = useCallback(async (previewUrl?: string) => {
@@ -8459,15 +8401,16 @@ export function ImageNode({
                     }}
                   >
                     <div className="absolute inset-0 bg-slate-50 dark:bg-zinc-900" />
-                    <img
+                    <CanvasPreviewImage
+                      sourceKey={data.src}
                       alt={displayTitle}
                       className="absolute inset-0 h-full w-full object-cover"
                       decoding="async"
                       draggable={false}
-                      loading="lazy"
+                      loading="eager"
                       onError={(event) => {
-                        if (event.currentTarget.src !== data.src) {
+                        if (event.currentTarget.src !== buildImageFallbackUrl(data.src)) {
-                          event.currentTarget.src = data.src;
+                          event.currentTarget.src = buildImageFallbackUrl(data.src);
                         }
                       }}
                       onLoad={handleDisplayImageLoad}
@@ -8488,15 +8431,16 @@ export function ImageNode({
                     }}
                   >
                     <div className="absolute inset-0 bg-slate-50 dark:bg-zinc-900" />
-                    <img
+                    <CanvasPreviewImage
+                      sourceKey={compareSource}
                       alt={`${displayTitle}-原图`}
                       className="absolute inset-0 h-full w-full object-cover"
                       decoding="async"
                       draggable={false}
-                      loading="lazy"
+                      loading="eager"
                       onError={(event) => {
-                        if (event.currentTarget.src !== compareSource) {
+                        if (event.currentTarget.src !== buildImageFallbackUrl(compareSource)) {
-                          event.currentTarget.src = compareSource;
+                          event.currentTarget.src = buildImageFallbackUrl(compareSource);
                         }
                       }}
                       src={displayCompareSrc}
@@ -8538,7 +8482,8 @@ export function ImageNode({
               </div>
             ) : (
               <>
-                <img
+                <CanvasPreviewImage
+                  sourceKey={data.src}
                   alt={displayTitle}
                   className={cn(
                     "h-full w-full bg-slate-50 object-contain dark:bg-zinc-900",
@@ -8550,7 +8495,7 @@ export function ImageNode({
                   )}
                   decoding="async"
                   draggable={false}
-                  loading="lazy"
+                  loading="eager"
                   onClick={
                     isThisNodePicking && !boxCutoutMode
                       ? handlePickerClick
@@ -8559,12 +8504,17 @@ export function ImageNode({
                   onDoubleClick={(e) => {
                     if (!isThisNodePicking && !boxCutoutMode && !localEditMode) {
                       e.stopPropagation();
+                      setFullscreenPreviewImage({
+                        src: e.currentTarget.currentSrc || e.currentTarget.src,
+                        width: e.currentTarget.naturalWidth,
+                        height: e.currentTarget.naturalHeight,
+                      });
                       setFullscreenPreviewOpen(true);
                     }
                   }}
                   onError={(event) => {
-                    if (event.currentTarget.src !== data.src) {
+                    if (event.currentTarget.src !== buildImageFallbackUrl(data.src)) {
-                      event.currentTarget.src = data.src;
+                      event.currentTarget.src = buildImageFallbackUrl(data.src);
                     }
                   }}
                   onLoad={handleDisplayImageLoad}
@@ -9475,6 +9425,8 @@ export function ImageNode({
         ) : (
           <ImageNodeEmptyState
             detailProgressLabel={detailProgressLabel}
+            failure={data.metadata?.generationFailure}
+            requestId={data.metadata?.generationRequestId}
             fileInputRef={fileInputRef}
             generationProgress={generationProgress}
             onImageUpload={handleImageUpload}
@@ -11964,6 +11916,7 @@ export function ImageNode({
       {/* 双击放大预览弹窗 */}
       {fullscreenPreviewOpen &&
         data.src &&
+        fullscreenPreviewImage &&
         createPortal(
           <div
             className="fixed inset-0 z-[9999] flex cursor-zoom-out items-center justify-center bg-black/90"
@@ -11971,7 +11924,7 @@ export function ImageNode({
           >
             {/* 关闭按钮 */}
             <button
-              className="absolute top-4 right-4 rounded-full bg-slate-950 p-2 transition-colors hover:bg-black"
+              className="absolute top-4 right-4 z-10 rounded-full bg-slate-950 p-2 transition-colors hover:bg-black"
               onClick={() => setFullscreenPreviewOpen(false)}
             >
               <svg
@@ -11989,7 +11942,7 @@ export function ImageNode({
               </svg>
             </button>
             <button
-              className="absolute top-4 right-16 inline-flex items-center gap-1.5 rounded-full bg-slate-950 px-3 py-2 text-sm text-white transition-colors hover:bg-black disabled:cursor-not-allowed disabled:opacity-60"
+              className="absolute top-4 right-16 z-10 inline-flex items-center gap-1.5 rounded-full bg-slate-950 px-3 py-2 text-sm text-white transition-colors hover:bg-black disabled:cursor-not-allowed disabled:opacity-60"
               disabled={isDownloadingOriginalImage}
               onClick={(event) => {
                 event.preventDefault();
@@ -12008,13 +11961,11 @@ export function ImageNode({
             </button>
 
             {/* 图片 */}
-            <img
+            <ProgressiveImagePreview
               alt={data.prompt || "图片预览"}
               className="max-h-[95vh] max-w-[95vw] object-contain"
-              decoding="async"
+              src={resolveOriginalImageUrl(data.src) || data.src}
-              draggable={false}
+              preview={fullscreenPreviewImage}
-              onClick={(e) => e.stopPropagation()}
-              src={fullscreenPreviewSrc}
               style={activeImageAdjustmentsStyle}
             />
 

components/canvas/nodes/image-node/canvas-preview-image.tsx

@@ -0,0 +1,32 @@
+"use client";
+
+import { forwardRef, type ImgHTMLAttributes, useState } from "react";
+
+type Props = Omit<ImgHTMLAttributes<HTMLImageElement>, "src"> & { src: string; sourceKey: string };
+
+export const CanvasPreviewImage = forwardRef<HTMLImageElement, Props>(function CanvasPreviewImage(
+  { src, sourceKey, onLoad, style, ...props }, ref,
+) {
+  const [displayed, setDisplayed] = useState({ sourceKey, src });
+  const visibleSrc = displayed.sourceKey === sourceKey ? displayed.src : src;
+  const sources = visibleSrc === src ? [src] : [visibleSrc, src];
+  return <>{sources.map(candidate => {
+    const visible = candidate === visibleSrc;
+    return <img
+      {...props}
+      key={candidate}
+      ref={visible ? ref : undefined}
+      src={candidate}
+      alt={visible ? props.alt : ""}
+      aria-hidden={visible ? props["aria-hidden"] : true}
+      style={visible ? style : { ...style, position: "absolute", inset: 0, opacity: 0, pointerEvents: "none" }}
+      onLoad={event => {
+        const image = event.currentTarget;
+        onLoad?.(event);
+        void image.decode().then(() => {
+          if (image.isConnected && candidate === src) setDisplayed({ sourceKey, src: candidate });
+        }).catch(() => undefined);
+      }}
+    />;
+  })}</>;
+});

components/canvas/nodes/image-node/image-node-empty-state.tsx

@@ -3,11 +3,14 @@
 import { AlertCircle, ImagePlus, Loader2 } from "lucide-react";
 import type React from "react";
 import { GenerationDotPlaceholder } from "@/components/generation-dot-placeholder";
+import type { RequestFailureDetails } from "@/lib/request-error";
 
 interface ImageNodeEmptyStateProps {
   detailProgressLabel?: string;
   fileInputRef: React.Ref<HTMLInputElement>;
   generationProgress?: number | null;
+  failure?: RequestFailureDetails;
+  requestId?: string;
   onImageUpload: (event: React.ChangeEvent<HTMLInputElement>) => void;
   onSelectFile: (event: React.MouseEvent<HTMLButtonElement>) => void;
   status?: string;
@@ -52,6 +55,8 @@ export function ImageNodeEmptyState({
   detailProgressLabel,
   fileInputRef,
   generationProgress,
+  failure,
+  requestId,
   onImageUpload,
   onSelectFile,
   status,
@@ -89,7 +94,7 @@ export function ImageNodeEmptyState({
   if (status === "failed") {
     const failedTitle = detailProgressLabel || "生成失败";
     return (
-      <div className="flex h-full w-full select-none flex-col items-center justify-center bg-[#fff7f8] px-6 text-center dark:bg-red-950/40">
+      <div role="alert" className="flex h-full w-full flex-col items-center justify-center overflow-auto bg-[#fff7f8] px-6 text-center dark:bg-red-950/40">
         <span className="mb-3 flex h-12 w-12 items-center justify-center rounded-[18px] border border-[#f2d7dd] bg-white text-[#d24f63] shadow-[0_0_0_1px_rgba(242,215,221,0.22)]">
           <AlertCircle className="h-5 w-5" />
         </span>
@@ -97,8 +102,9 @@ export function ImageNodeEmptyState({
           {failedTitle}
         </span>
         <span className="mt-1 text-xs text-[#b77480]">
-          {failedTitle.includes("上传") ? "请重新选择文件" : "请重新上传或再试一次"}
+          {failure?.recommendation || (failedTitle.includes("上传") ? "请重新选择文件" : "请查看对话中的错误原因和处理建议")}
         </span>
+        {requestId ? <span className="mt-2 select-text break-all text-xs text-[#b77480]">请求编号：{requestId}</span> : null}
       </div>
     );
   }

components/elements/response.tsx

@@ -15,7 +15,7 @@ import {
   splitOpenClawChartBlocks,
 } from "@/components/elements/openclaw-chart-card";
 import { ResponsePdfDownloadButton } from "@/components/elements/response-pdf-download";
-import { buildImageProxyUrl } from "@/lib/image-delivery";
+import { buildImageFallbackUrl, buildImageProxyUrl } from "@/lib/image-delivery";
 import { splitMarkdownImages } from "@/lib/canvas/markdown-image-segments";
 import { stableStreamingMarkdown } from "@/lib/canvas/markdown-image-streaming";
 import { getGatewayErrorPageMessage } from "@/lib/request-error";
@@ -442,8 +442,8 @@ function MarkdownTableImagePreview({
           loading="lazy"
           decoding="async"
           onError={(event) => {
-            if (event.currentTarget.src !== src) {
+            if (event.currentTarget.src !== buildImageFallbackUrl(src)) {
-              event.currentTarget.src = src;
+              event.currentTarget.src = buildImageFallbackUrl(src);
             }
           }}
         />
@@ -473,8 +473,8 @@ function MarkdownTableImagePreview({
             decoding="async"
             onClick={(event) => event.stopPropagation()}
             onError={(event) => {
-              if (event.currentTarget.src !== originalSrc) {
+              if (event.currentTarget.src !== buildImageFallbackUrl(originalSrc)) {
-                event.currentTarget.src = originalSrc;
+                event.currentTarget.src = buildImageFallbackUrl(originalSrc);
               }
             }}
           />

components/generation-dot-placeholder.tsx

@@ -1,6 +1,5 @@
 "use client";
 
-import { useEffect, useMemo, useState } from "react";
 import { BloubAvatar } from "@/components/bloub-avatar";
 import type { StateId } from "@/lib/bloub-official/states";
 import { cn } from "@/lib/utils";
@@ -26,193 +25,17 @@ interface GenerationDotPlaceholderProps {
 const PHASE_TITLES: Record<GenerationPhase, string> = {
   idle: "正在创建图片",
   queued: "等待开始生成",
-  processing: "生成初稿中",
+  processing: "等待模型返回图片",
-  finalizing: "正在润饰细节",
+  finalizing: "正在保存生成结果",
   failed: "生成失败",
   completed: "生成完成",
 };
 
-const GENERATION_STATUS_TITLES = [
-  "正在理解画面关系",
-  "正在读取参考图片",
-  "正在分析主体轮廓",
-  "正在识别关键元素",
-  "正在整理构图线索",
-  "正在确认画面比例",
-  "正在匹配视觉风格",
-  "正在提取材质细节",
-  "正在梳理光影方向",
-  "正在构建初始画面",
-  "正在生成第一版构图",
-  "正在安排主体位置",
-  "正在校准画面重心",
-  "正在补全背景层次",
-  "正在保持主体一致",
-  "正在优化边缘结构",
-  "正在调整透视关系",
-  "正在细化空间层次",
-  "正在增强画面清晰度",
-  "正在统一色彩倾向",
-  "正在检查参考一致性",
-  "正在处理局部细节",
-  "正在补充纹理信息",
-  "正在修正不自然区域",
-  "正在平衡明暗对比",
-  "正在优化产品质感",
-  "正在调整阴影落点",
-  "正在整理背景干扰",
-  "正在增强真实感",
-  "正在重绘细小结构",
-  "正在合成高清结果",
-  "正在检查主体完整性",
-  "正在优化画面边缘",
-  "正在处理反光细节",
-  "正在提升材质表现",
-  "正在微调构图节奏",
-  "正在清理多余噪点",
-  "正在强化视觉焦点",
-  "正在校正颜色偏差",
-  "正在保留参考特征",
-  "正在生成高分辨率版本",
-  "正在压实画面层次",
-  "正在修饰局部瑕疵",
-  "正在检查文字与图形",
-  "正在稳定画面结构",
-  "正在优化细节密度",
-  "正在完善背景过渡",
-  "正在增强主体质感",
-  "正在统一整体光感",
-  "正在检查比例关系",
-  "正在修正边缘锯齿",
-  "正在提升清晰观感",
-  "正在处理最后细节",
-  "正在准备预览结果",
-  "正在同步生成进度",
-  "正在确认输出尺寸",
-  "正在整理结果文件",
-  "正在校验图片可用性",
-  "正在生成最终预览",
-  "正在完成高清渲染",
-  "正在保存生成结果",
-  "正在写入画布节点",
-  "正在同步到对话框",
-  "正在检查结果完整性",
-  "正在收尾生成任务",
-  "正在等待服务商返回",
-  "正在保持连接状态",
-  "正在确认生成结果",
-  "正在拉取图片地址",
-  "正在准备展示图片",
-  "正在完成最后处理",
-  "正在刷新画布内容",
-  "正在整理图片信息",
-  "正在完成本次生成",
-  "正在即将展示结果",
-];
-
-const LONG_WAIT_TITLE_THRESHOLD_MS = 5 * 60 * 1000;
-const LONG_WAIT_STATUS_TITLES = [
-  "服务繁忙，排队处理中",
-  "高峰期生成较慢，请耐心等候",
-  "仍在保持连接，等待模型返回",
-  "结果返回后会自动展示",
-];
-const STATUS_TITLE_DURATIONS_MS = GENERATION_STATUS_TITLES.map((_, index) => {
-  const rhythm = [3600, 5200, 4100, 6100, 3300, 4700, 5700, 3900, 6800, 4400];
-  return rhythm[index % rhythm.length];
-});
-const TYPEWRITER_START_DELAY_MS = 120;
-const TYPEWRITER_BASE_STEP_MS = 46;
-
 function clampProgress(value: number) {
   if (!Number.isFinite(value)) return 0;
   return Math.max(0, Math.min(100, Math.round(value)));
 }
 
-function estimateProgress(phase: GenerationPhase, elapsedMs: number) {
-  if (phase === "completed" || phase === "failed") return 100;
-  if (phase === "finalizing") return 96;
-  if (phase === "queued") {
-    return clampProgress(6 + Math.min(12, elapsedMs / 3500));
-  }
-  if (phase === "processing") {
-    const eased = 1 - Math.exp(-elapsedMs / 85_000);
-    return clampProgress(18 + eased * 78);
-  }
-  return clampProgress(Math.min(8, elapsedMs / 1000));
-}
-
-function getStatusTitleState(elapsedMs: number, initialTitle?: string) {
-  const titles = initialTitle
-    ? [
-        initialTitle,
-        ...GENERATION_STATUS_TITLES.filter((item) => item !== initialTitle),
-      ]
-    : GENERATION_STATUS_TITLES;
-  const durations = initialTitle
-    ? [4200, ...STATUS_TITLE_DURATIONS_MS]
-    : STATUS_TITLE_DURATIONS_MS;
-
-  let cursor = Math.max(0, elapsedMs);
-  for (let index = 0; index < titles.length; index += 1) {
-    const duration = durations[index] || 4600;
-    if (cursor < duration) {
-      return {
-        elapsedInTitle: cursor,
-        index,
-        title:
-          titles[index] ||
-          titles[titles.length - 1] ||
-          PHASE_TITLES.processing,
-      };
-    }
-    cursor -= duration;
-  }
-
-  return {
-    elapsedInTitle: durations[durations.length - 1] || 4600,
-    index: titles.length - 1,
-    title: titles[titles.length - 1] || PHASE_TITLES.processing,
-  };
-}
-
-function getLongWaitTitleState(elapsedMs: number, initialTitle?: string) {
-  const titles = initialTitle
-    ? [
-        initialTitle,
-        ...LONG_WAIT_STATUS_TITLES.filter((item) => item !== initialTitle),
-      ]
-    : LONG_WAIT_STATUS_TITLES;
-  const elapsedAfterThreshold = Math.max(
-    0,
-    elapsedMs - LONG_WAIT_TITLE_THRESHOLD_MS
-  );
-  const duration = 7600;
-  const index = Math.floor(elapsedAfterThreshold / duration) % titles.length;
-
-  return {
-    elapsedInTitle: elapsedAfterThreshold % duration,
-    index,
-    title: titles[index] || titles[0] || PHASE_TITLES.processing,
-  };
-}
-
-function getTypewriterText(text: string, elapsedInTitle: number, index: number) {
-  const chars = Array.from(text);
-  if (chars.length === 0) return "";
-  const step = TYPEWRITER_BASE_STEP_MS + (index % 5) * 8;
-  const visibleCount = Math.max(
-    1,
-    Math.min(
-      chars.length,
-      Math.floor(
-        Math.max(0, elapsedInTitle - TYPEWRITER_START_DELAY_MS) / step
-      ) + 1
-    )
-  );
-  return chars.slice(0, visibleCount).join("");
-}
-
 function getBloubState(phase: GenerationPhase): StateId {
   if (phase === "failed") return "alert";
   if (phase === "completed") return "wink";
@@ -228,39 +51,10 @@ export function GenerationDotPlaceholder({
   showProgress = true,
   title,
 }: GenerationDotPlaceholderProps) {
-  const [elapsedMs, setElapsedMs] = useState(0);
+  const resolvedProgress = typeof progress === "number" && Number.isFinite(progress)
-
+    ? clampProgress(progress) : null;
-  useEffect(() => {
+  const resolvedTitle = title || PHASE_TITLES[phase];
-    const startedAt = Date.now();
-    const timer = window.setInterval(() => {
-      setElapsedMs(Date.now() - startedAt);
-    }, 90);
-    return () => window.clearInterval(timer);
-  }, [phase]);
-
-  const resolvedProgress = clampProgress(
-    typeof progress === "number" ? progress : estimateProgress(phase, elapsedMs)
-  );
-  const isLongWaitTitle =
-    (phase === "processing" || phase === "finalizing") &&
-    elapsedMs >= LONG_WAIT_TITLE_THRESHOLD_MS;
-  const statusTitleState = isLongWaitTitle
-    ? getLongWaitTitleState(elapsedMs, title)
-    : getStatusTitleState(elapsedMs, title);
-  const rotatingTitle = getTypewriterText(
-    statusTitleState.title,
-    statusTitleState.elapsedInTitle,
-    statusTitleState.index
-  );
-  const resolvedTitle =
-    phase === "processing" || phase === "finalizing"
-      ? rotatingTitle
-      : title || PHASE_TITLES[phase];
   const playSequence = phase === "processing" || phase === "finalizing";
-  const progressStyle = useMemo(
-    () => ({ width: `${resolvedProgress}%` }),
-    [resolvedProgress]
-  );
 
   return (
     <div
@@ -281,10 +75,6 @@ export function GenerationDotPlaceholder({
           )}
         >
           {resolvedTitle}
-          <span
-            aria-hidden="true"
-            className="ml-1 inline-block h-[1em] w-[0.08em] translate-y-[0.15em] animate-[generationCursorBlink_1s_steps(1,end)_infinite] bg-current"
-          />
         </div>
 
         <div className="flex min-h-0 flex-1 items-center justify-center py-3">
@@ -297,13 +87,13 @@ export function GenerationDotPlaceholder({
           />
         </div>
 
-        {showProgress ? (
+        {showProgress && phase !== "completed" ? (
           <div className="space-y-2">
             <div className="flex items-center justify-between text-[12px] font-medium text-[#7d838b] dark:text-zinc-400">
-              <span>{phase === "failed" ? "已停止" : "生成进度"}</span>
+              <span>{phase === "failed" ? "已停止" : resolvedProgress === null ? "等待结果，返回后自动展示" : "生成进度"}</span>
-              <span>{resolvedProgress}%</span>
+              {resolvedProgress !== null ? <span>{resolvedProgress}%</span> : null}
             </div>
-            <div className="h-1.5 overflow-hidden rounded-full bg-white/80 shadow-[inset_0_0_0_1px_rgba(0,0,0,0.035)] dark:bg-white/10 dark:shadow-none">
+            {resolvedProgress !== null ? <div role="progressbar" aria-valuenow={resolvedProgress} aria-valuemin={0} aria-valuemax={100} className="h-1.5 overflow-hidden rounded-full bg-white/80 shadow-[inset_0_0_0_1px_rgba(0,0,0,0.035)] dark:bg-white/10 dark:shadow-none">
               <div
                 className={cn(
                   "h-full rounded-full transition-[width] duration-700 ease-out",
@@ -311,25 +101,12 @@ export function GenerationDotPlaceholder({
                     ? "bg-[#c7ccd3] dark:bg-zinc-600"
                     : "bg-[#0a0a0c] dark:bg-[#3ecf8e]"
                 )}
-                style={progressStyle}
+                style={{ width: `${resolvedProgress}%` }}
               />
-            </div>
+            </div> : null}
           </div>
         ) : null}
       </div>
-
-      <style jsx>{`
-        @keyframes generationCursorBlink {
-          0%,
-          48% {
-            opacity: 1;
-          }
-          49%,
-          100% {
-            opacity: 0;
-          }
-        }
-      `}</style>
     </div>
   );
 }

components/image-annotator.tsx

@@ -918,9 +918,9 @@ export function ImageAnnotator({
 
     setIsRemovingBg(true);
     try {
-      // 使用原图URL获取原图数据，而不是canvas的预览图
+      const input = /^https?:\/\//i.test(originalImageUrl)
-      const base64Data = await imageUrlToBase64(originalImageUrl);
+        ? { imageUrl: originalImageUrl }
-      logger.debug("rmbg_source_prepared", { base64Length: base64Data.length });
+        : { image_base64: await imageUrlToBase64(originalImageUrl) };
 
       // 调用抠图API
       const response = await fetch("/api/rmbg", {
@@ -929,7 +929,7 @@ export function ImageAnnotator({
           "Content-Type": "application/json",
         },
         body: JSON.stringify({
-          image_base64: base64Data,
+          ...input,
           prompt: "画图标注-抠图处理", // 可选：添加提示词
         }),
       });

components/image-generation-loading.tsx

@@ -41,45 +41,11 @@ const PHASE_HINT: Record<NonNullable<ImageGenerationLoadingProps["phase"]>, stri
   idle: "任务已创建，正在初始化生成参数。",
   queued: "任务已进入队列，请稍候。",
   processing: "模型正在生成图片，请稍候。",
-  finalizing: "图片已生成完成，正在同步到对话。",
+  finalizing: "图片已返回，正在保存并同步到对话。",
-  failed: "生成失败，请重试。",
+  failed: "本次处理已停止，请查看对话中的原因和建议。",
 };
 
-const LONG_PROCESSING_HINTS = [
-  "正在读取参考图与文字需求。",
-  "正在分析主体、场景和构图关系。",
-  "正在提取画面中的关键视觉特征。",
-  "正在确认图片比例和输出尺寸。",
-  "正在匹配当前模型的最佳生成参数。",
-  "正在把参考图信息提交给模型。",
-  "正在等待模型完成第一阶段推理。",
-  "正在生成初始画面结构。",
-  "正在保持主体特征和参考一致。",
-  "正在补全画面中的空间层次。",
-  "正在调整光影方向和明暗关系。",
-  "正在优化主体边缘与背景融合。",
-  "正在细化材质、纹理和局部细节。",
-  "正在减少画面噪点和不自然区域。",
-  "正在提升清晰度与整体质感。",
-  "正在检查生成结果的完整性。",
-  "正在处理高分辨率输出。",
-  "正在等待服务商返回最终图片。",
-  "正在保存图片并同步到对话。",
-  "正在准备把结果显示到画布。",
-];
 const LONG_WAIT_SECONDS = 5 * 60;
-const LONG_WAIT_HINT =
-  "服务繁忙，模型可能正在排队或自动尝试备用通道，请耐心等候，结果返回后会自动同步到画布。";
-
-function getLongProcessingHint(phase: NonNullable<ImageGenerationLoadingProps["phase"]>, elapsedSeconds: number) {
-  if (phase !== "processing" && phase !== "finalizing") return PHASE_HINT[phase];
-  if (elapsedSeconds >= LONG_WAIT_SECONDS) return LONG_WAIT_HINT;
-  const index = Math.min(
-    LONG_PROCESSING_HINTS.length - 1,
-    Math.floor(Math.max(0, elapsedSeconds) / 15)
-  );
-  return LONG_PROCESSING_HINTS[index];
-}
 
 function formatImageQueueWaitLabel(estimatedWaitMs?: number) {
   const numeric = Number(estimatedWaitMs || 0);
@@ -138,16 +104,8 @@ export const ImageGenerationLoading = memo(
     const isLongWait =
       resolvedElapsedSeconds >= LONG_WAIT_SECONDS &&
       (phase === "processing" || phase === "finalizing");
-    const estimateRangeLabel = isLongWait
+    const elapsedLabel = resolvedElapsedSeconds > 0 ? `已等待 ${resolvedElapsedSeconds}s` : "";
-      ? "单次最长约10分钟"
+    const phaseHint = PHASE_HINT[phase];
-      : providerType === "grsai-gpt-image"
-        ? "2～5分钟"
-        : "60～120秒";
-    const elapsedLabel =
-      resolvedElapsedSeconds > 0
-        ? `已等待 ${resolvedElapsedSeconds}s`
-        : `预计 ${estimateRangeLabel}`;
-    const phaseHint = getLongProcessingHint(phase, resolvedElapsedSeconds);
     const queueLine =
       phase === "queued" && Number.isFinite(queuePosition)
         ? Math.max(0, Number(queuePosition || 0)) > 0
@@ -189,12 +147,12 @@ export const ImageGenerationLoading = memo(
             }
             compact={count > 1}
             phase={phase}
-            title={isLongWait ? "服务繁忙，排队处理中" : undefined}
+            title={isLongWait && phase === "processing" ? "模型尚未返回结果，请勿重复提交" : undefined}
           />
 
           <div className="space-y-0.5 text-[#9aa3b2]">
             <div className="text-[13px] font-medium">
-              使用 {resolvedModelName} 生成图片，预计 {estimateRangeLabel}
+              使用 {resolvedModelName} 生成图片
             </div>
             {queueLine ? <div className="text-[13px]">{queueLine}</div> : null}
             {queueDetailLine ? <div className="text-[13px]">{queueDetailLine}</div> : null}

components/image-preview.tsx

@@ -1,11 +1,12 @@
 "use client";
-import { isRetiredStorageUrl, RETIRED_STORAGE_MESSAGE } from "@/lib/storage/retired-storage";
+import { isRetiredStorageUrl, normalizeLegacyAliyunStorageUrl, RETIRED_STORAGE_MESSAGE } from "@/lib/storage/retired-storage";
 
 import dynamic from "next/dynamic";
 import React, { useState, useEffect } from "react";
 import { X, Download, Edit, Target, Paintbrush, Sparkles, Scissors, Expand, Maximize2, Move3D, Droplet } from "lucide-react";
 import { toast } from "sonner";
-import { buildImageProxyUrl, getImageDownloadExtension } from "@/lib/image-delivery";
+import { buildImageProxyUrl } from "@/lib/image-delivery";
+import { downloadOriginalImage, getCanvasImageDownloadErrorMessage } from "@/lib/client/canvas-image-download";
 
 const ImageAnnotator = dynamic(
   () => import("./image-annotator").then((module) => module.ImageAnnotator),
@@ -23,25 +24,6 @@ const AngleEditDialog = dynamic(
   }
 );
 
-function triggerBrowserDownload(
-  url: string,
-  filename?: string,
-  options?: { openInNewTab?: boolean }
-) {
-  const link = document.createElement("a");
-  link.href = url;
-  if (filename) {
-    link.download = filename;
-  }
-  if (options?.openInNewTab) {
-    link.target = "_blank";
-  }
-  link.rel = "noopener noreferrer";
-  document.body.appendChild(link);
-  link.click();
-  document.body.removeChild(link);
-}
-
 export function ImagePreview({ 
   src, 
   alt,
@@ -238,24 +220,12 @@ export function ImagePreview({
       toast.error("下载失败，请重试");
       return;
     }
-    const filenameBase = `generated-image-${Date.now()}`;
     try {
-      const response = await fetch(
+      await downloadOriginalImage({ url: safeOriginalUrl });
-        buildImageProxyUrl(safeOriginalUrl, { delivery: "original" })
+      toast.success("原图已开始下载");
-      );
-      if (!response.ok) {
-        throw new Error(`下载失败（${response.status}）`);
-      }
-      const blob = await response.blob();
-      const extension = getImageDownloadExtension(blob.type);
-      const filename = extension ? `${filenameBase}.${extension}` : filenameBase;
-      const url = window.URL.createObjectURL(blob);
-      triggerBrowserDownload(url, filename);
-      window.URL.revokeObjectURL(url);
-      toast.success("下载成功");
     } catch (error) {
       console.error("下载失败:", error);
-      toast.error(error instanceof Error && error.message.includes("无法确认原图") ? error.message : "原图下载失败，请重试");
+      toast.error(getCanvasImageDownloadErrorMessage(error));
     }
   };
 
@@ -337,9 +307,18 @@ export function ImagePreview({
           }}
           loading="lazy"
           decoding="async"
+          onLoad={(event) => {
+            event.currentTarget.style.aspectRatio = "";
+            event.currentTarget.parentElement?.style.removeProperty("width");
+            event.currentTarget.alt = "Generated Image";
+          }}
           onError={(event) => {
-            if (event.currentTarget.src !== (thumbnail || original)) {
+            if (!normalizeLegacyAliyunStorageUrl(thumbnail || original) && event.currentTarget.src !== (thumbnail || original)) {
               event.currentTarget.src = thumbnail || original;
+            } else if (!compactGrid) {
+              event.currentTarget.style.aspectRatio = "1";
+              event.currentTarget.parentElement?.style.setProperty("width", "100%");
+              event.currentTarget.alt = "预览暂不可用，可尝试下载原图";
             }
           }}
           onClick={() => setIsOpen(true)}
@@ -631,7 +610,7 @@ export function ImagePreview({
             onClick={(e: React.MouseEvent) => e.stopPropagation()}
           >
             <img
-              src={original}
+              src={normalizeLegacyAliyunStorageUrl(original) ? buildImageProxyUrl(original) : original}
               alt="Generated Image - Original"
               className={`max-h-[90vh] max-w-full rounded-lg object-contain ${
                 isAnnotationMode ? "cursor-crosshair" : ""

components/preview-attachment.tsx

@@ -9,6 +9,7 @@ import { Button } from "./ui/button";
 import { X, Download, Target, Paintbrush } from "lucide-react";
 import { toast } from "sonner";
 import { ImageAnnotator } from "./image-annotator";
+import { downloadOriginalImage, getCanvasImageDownloadErrorMessage } from "@/lib/client/canvas-image-download";
 
 export const PreviewAttachment = ({
   attachment,
@@ -73,18 +74,11 @@ export const PreviewAttachment = ({
   // 下载图片函数
   const handleDownload = async () => {
     try {
-      const response = await fetch(url);
+      await downloadOriginalImage({ url, name: name ?? "image" });
-      const blob = await response.blob();
+      toast.success("原图已开始下载");
-      const downloadUrl = window.URL.createObjectURL(blob);
-      const link = document.createElement("a");
-      link.href = downloadUrl;
-      link.download = name ?? `image-${Date.now()}.jpg`;
-      document.body.appendChild(link);
-      link.click();
-      document.body.removeChild(link);
-      window.URL.revokeObjectURL(downloadUrl);
     } catch (error) {
       console.error("下载失败:", error);
+      toast.error(getCanvasImageDownloadErrorMessage(error));
     }
   };
 

components/progressive-image-preview.tsx

@@ -0,0 +1,74 @@
+"use client";
+
+import { useEffect, useState, type CSSProperties, type MouseEventHandler } from "react";
+import { buildImageProxyUrl, getFullscreenPreviewSize } from "@/lib/image-delivery";
+
+export type LoadedImagePreview = { src: string; width: number; height: number };
+
+/** Keep the already displayed image visible while its larger preview loads. */
+export function ProgressiveImagePreview({
+  src,
+  preview,
+  alt,
+  className,
+  style,
+  onClick,
+}: {
+  src: string;
+  preview: LoadedImagePreview;
+  alt: string;
+  className?: string;
+  style?: CSSProperties;
+  onClick?: MouseEventHandler<HTMLImageElement>;
+}) {
+  const size = getFullscreenPreviewSize({
+    imageWidth: preview.width,
+    imageHeight: preview.height,
+    viewportWidth: typeof window === "undefined" ? 1280 : window.innerWidth,
+    viewportHeight: typeof window === "undefined" ? 900 : window.innerHeight,
+    pixelRatio: typeof window === "undefined" ? 1 : window.devicePixelRatio,
+  });
+  const fullSrc = buildImageProxyUrl(src, {
+    delivery: "proxy",
+    width: size.requestWidth,
+    quality: 86,
+    format: "webp",
+  });
+  const [loadedSrc, setLoadedSrc] = useState("");
+  const [failedSrc, setFailedSrc] = useState("");
+  const ready = fullSrc === preview.src || loadedSrc === fullSrc;
+  const failed = failedSrc === fullSrc;
+
+  useEffect(() => {
+    if (fullSrc === preview.src) return;
+    const image = new Image();
+    image.decoding = "async";
+    image.onload = () => setLoadedSrc(fullSrc);
+    image.onerror = () => setFailedSrc(fullSrc);
+    image.src = fullSrc;
+    return () => {
+      image.onload = null;
+      image.onerror = null;
+      image.removeAttribute("src");
+    };
+  }, [fullSrc, preview.src]);
+
+  return (
+    <div className="relative flex items-center justify-center" onClick={(event) => event.stopPropagation()}>
+      <img
+        alt={alt}
+        className={className}
+        decoding="async"
+        draggable={false}
+        onClick={onClick}
+        src={ready ? fullSrc : preview.src}
+        style={{ width: size.displayWidth, ...style }}
+      />
+      {!ready && (
+        <div role="status" className="pointer-events-none absolute bottom-4 max-w-full rounded-lg bg-black/80 px-3 py-2 text-center text-sm text-white">
+          {failed ? "高清预览加载失败，已保留当前预览；可关闭后重试或下载原图" : "正在加载高清预览…"}
+        </div>
+      )}
+    </div>
+  );
+}

components/scene-fusion-view.tsx

@@ -1,4 +1,5 @@
 "use client";
+import { downloadOriginalImage, getCanvasImageDownloadErrorMessage } from "@/lib/client/canvas-image-download";
 
 import {
   ArrowLeft,
@@ -2073,18 +2074,9 @@ export function SceneFusionView({
 
   const downloadImage = async (url: string, filename: string) => {
     try {
-      const response = await fetch(url);
+      await downloadOriginalImage({ url, name: filename });
-      const blob = await response.blob();
+    } catch (error) {
-      const blobUrl = URL.createObjectURL(blob);
+      toast.error(getCanvasImageDownloadErrorMessage(error));
-      const link = document.createElement("a");
-      link.href = blobUrl;
-      link.download = filename;
-      document.body.appendChild(link);
-      link.click();
-      document.body.removeChild(link);
-      setTimeout(() => URL.revokeObjectURL(blobUrl), 100);
-    } catch {
-      window.open(url, "_blank");
     }
   };
 

components/ui/alert-dialog.tsx

@@ -29,10 +29,10 @@ AlertDialogOverlay.displayName = AlertDialogPrimitive.Overlay.displayName
 
 const AlertDialogContent = React.forwardRef<
   React.ElementRef<typeof AlertDialogPrimitive.Content>,
-  React.ComponentPropsWithoutRef<typeof AlertDialogPrimitive.Content>
+  React.ComponentPropsWithoutRef<typeof AlertDialogPrimitive.Content> & { overlayClassName?: string }
->(({ className, ...props }, ref) => (
+>(({ className, overlayClassName, ...props }, ref) => (
   <AlertDialogPortal>
-    <AlertDialogOverlay />
+    <AlertDialogOverlay className={overlayClassName} />
     <AlertDialogPrimitive.Content
       ref={ref}
       className={cn(

docs/production-48.md

@@ -92,8 +92,16 @@ public 先从当前运行版本创建写入时复制副本，保留未纳入 Git
 
 原生产 checkout 的支线及未提交改动仍保留，不能据其 Git HEAD 判断已发布版本。
 实际发布证据是：运行 cwd、`.next/BUILD_ID`、该目录 `release.json` 和 `activation.json`。
+`next.config.ts` 将本流程的发布目录编号写入前后端版本标识；`/api/app-version` 返回该编号且不缓存，发布烟测会核对它与运行目录一致。网页每分钟及切回页面时检查更新，发现版本变化后提示同步并刷新；画布同步失败或当前任务仍在处理时保留页面。首次接入前已经打开的旧网页需先刷新一次，后续发布即可自动收到提示。
 维护电脑的 `.git/releases/<发布ID>/` 保留提交、构建日志、烟测、传输校验和及操作回执。
 服务器回滚配置可能含环境元数据，目录权限为 0700、文件为 0600，不放入公开目录或 Git。
 
 仓库历史全量 lint 仍有已记录的问题，不能声称全部质量门禁通过。
 每次 PR 须记录本次改动的验证、历史失败和未覆盖项目；当前流程不会自动触发生产发布。
+
+## ZIP 下载交付
+
+默认存储为七牛时，完整 ZIP 通过分片上传至七牛，确认下载地址可用后才提供下载。
+大文件使用三个并发分片，上传进度显示在原打包任务中。传送或链接检查失败会返回具体阶段、
+下载编号及重试建议，保留已生成的 ZIP；再次点击下载复用原文件，已上传的完整对象不重复上传。
+后台 ZIP 任务参与发布期间的工作等待。完成或失败的任务及文件保留 24 小时，待处理任务保留 6 小时。

hooks/use-video-canvas-persistence.ts

@@ -1,6 +1,7 @@
 "use client";
 
 import { useCallback, useEffect, useRef, useState } from "react";
+import { BEFORE_PAGE_REFRESH, type PageRefreshRequest } from "@/lib/client/page-refresh";
 import { mergeCanvasSnapshots, type CanvasConflictChoice } from "@/lib/video-canvas/merge-snapshot";
 import {
   CanvasRevisionConflict,
@@ -149,6 +150,16 @@ export function useVideoCanvasPersistence(
     return !queue.dirty && !queue.failed;
   }, [ready]);
 
+  useEffect(() => {
+    const beforeRefresh = (event: Event) => {
+      (event as CustomEvent<PageRefreshRequest>).detail.save(async () => {
+        if (!(await saveAndConfirm())) throw new Error("视频画布尚未同步完成，本地草稿已保留，请重试刷新。");
+      });
+    };
+    window.addEventListener(BEFORE_PAGE_REFRESH, beforeRefresh);
+    return () => window.removeEventListener(BEFORE_PAGE_REFRESH, beforeRefresh);
+  }, [saveAndConfirm]);
+
   useEffect(() => {
     const onKeyDown = (event: KeyboardEvent) => {
       if ((event.metaKey || event.ctrlKey) && event.key.toLowerCase() === "s") {

lib/agents/mode-workspace-state.ts

@@ -14,6 +14,8 @@ import {
   sanitizeAgentDetailBrief,
 } from "@/lib/agents/detail-generation-config";
 
+export const MAX_DETAIL_REPLACEMENT_REFERENCES = 64;
+
 export function createEmptyAgentModeWorkspaceState(): AgentModeWorkspaceState {
   return {
     detailReplacement: {

lib/agents/workflow-composer.ts

@@ -407,14 +407,10 @@ function buildPromptSection(title: string, lines: string[]) {
   return `【${title}】\n${normalizedLines.join("\n")}`;
 }
 
-export function buildAgentWorkflowComposerContext(params: {
+export function resolveAgentWorkflowComposerSelections(params: {
   config?: AgentWorkflowUiConfig | null;
-  inputs: AgentWorkflowInputsValue;
-  materials?: AgentWorkflowMaterialSelections | null;
-  selectedBrandModel?: AgentWorkflowSelectedBrandModel | null;
-  appearanceRecognitionEnabled?: boolean;
   selections: Partial<Record<AgentWorkflowStepKey, string>>;
-}): AgentWorkflowComposerContext | null {
+}): AgentWorkflowComposerContext["selections"] {
   const config = params.config || defaultAgentWorkflowUiConfig;
   const steps = flattenVisibleAgentWorkflowSteps(
     getEnabledAgentWorkflowStepTree(Array.isArray(config.steps) ? config.steps : []),
@@ -422,13 +418,11 @@ export function buildAgentWorkflowComposerContext(params: {
   )
     .map(({ step }) => step)
     .filter((step) => Array.isArray(step.options) && step.options.length > 0);
-  const selections = steps
+  return steps.flatMap((step) => {
-    .map((step) => {
     const selectedOptions = getAgentWorkflowSelectedOptionPath({
       step,
       selectionValue: params.selections[step.key],
     });
-      if (selectedOptions.length === 0) return [];
     return selectedOptions.map((option) => ({
       stepKey: step.key,
       stepTitle: step.title,
@@ -436,8 +430,19 @@ export function buildAgentWorkflowComposerContext(params: {
       optionName: option.buttonName,
       promptFragment: option.promptFragment || option.buttonName,
     }));
-    })
+  });
-    .flat() as AgentWorkflowComposerContext["selections"];
+}
+
+export function buildAgentWorkflowComposerContext(params: {
+  config?: AgentWorkflowUiConfig | null;
+  inputs: AgentWorkflowInputsValue;
+  materials?: AgentWorkflowMaterialSelections | null;
+  selectedBrandModel?: AgentWorkflowSelectedBrandModel | null;
+  appearanceRecognitionEnabled?: boolean;
+  selections: Partial<Record<AgentWorkflowStepKey, string>>;
+  resolvedSelections?: AgentWorkflowComposerContext["selections"];
+}): AgentWorkflowComposerContext | null {
+  const selections = params.resolvedSelections ?? resolveAgentWorkflowComposerSelections(params);
   const referenceImages = getSelectedWorkflowReferenceImages({
     inputs: params.inputs,
     materials: params.materials,

lib/agents/workflow-loading.ts

@@ -0,0 +1,18 @@
+import type { AgentWorkflowOptionUiConfig, AgentWorkflowStepUiConfig } from "@/types/agent";
+
+export function omitAgentWorkflowPrompts(steps: AgentWorkflowStepUiConfig[]): AgentWorkflowStepUiConfig[] {
+  const omitOptionPrompt = ({ promptFragment: _prompt, children, ...option }: AgentWorkflowOptionUiConfig): AgentWorkflowOptionUiConfig => ({
+    ...option,
+    ...(children?.length ? { children: children.map(omitOptionPrompt) } : {}),
+  });
+  return steps.map(({ options, children, ...step }) => ({
+    ...step,
+    options: options.map(omitOptionPrompt),
+    ...(children?.length ? { children: omitAgentWorkflowPrompts(children) } : {}),
+  }));
+}
+
+export function getWorkflowSelectionsRequest(selections: Record<string, string | undefined>) {
+  const entries = Object.entries(selections).filter(([, value]) => value?.trim());
+  return entries.length ? JSON.stringify(Object.fromEntries(entries.sort(([a], [b]) => a.localeCompare(b)))) : "";
+}

lib/ai/box-cutout/service.ts

@@ -4,6 +4,9 @@ import {
   executeRmbgJob,
   fetchImageBufferFromUrl,
 } from "@/lib/ai/rmbg/service";
+import { createLogger } from "@/lib/observability/logger";
+
+const logger = createLogger("box-cutout-service");
 
 export type NormalizedCropRect = {
   x: number;
@@ -13,6 +16,7 @@ export type NormalizedCropRect = {
 };
 
 export interface ExecuteBoxCutoutJobParams {
+  requestId?: string;
   userId: string;
   imageUrl: string;
   cropRect: Partial<NormalizedCropRect>;
@@ -143,6 +147,7 @@ function applyPadding(
 export async function executeBoxCutoutJob(
   params: ExecuteBoxCutoutJobParams,
 ): Promise<ExecuteBoxCutoutJobResult> {
+  const requestId = params.requestId || crypto.randomUUID();
   const imageUrl = String(params.imageUrl || "").trim();
   if (!imageUrl) {
     throw new BoxCutoutServiceError("缺少 imageUrl 参数", 400);
@@ -150,7 +155,7 @@ export async function executeBoxCutoutJob(
 
   const cropRect = sanitizeNormalizedCropRect(params.cropRect);
   if (!cropRect) {
-    throw new BoxCutoutServiceError("缺少有效的 cropRect 参数", 400);
+    throw new BoxCutoutServiceError("框选范围无效，请重新框选需要抠出的区域后提交。", 400);
   }
 
   const paddingRatio = normalizeBoxCutoutPaddingRatio(params.paddingRatio);
@@ -170,7 +175,7 @@ export async function executeBoxCutoutJob(
 
   const cropRectPixels = toPixelRect(cropRect, sourceWidth, sourceHeight);
   if (cropRectPixels.width < MIN_CROP_EDGE_PX || cropRectPixels.height < MIN_CROP_EDGE_PX) {
-    throw new BoxCutoutServiceError("框选区域过小，请重新框选", 400);
+    throw new BoxCutoutServiceError("框选区域过小，宽、高均须至少 24 像素，请扩大框选范围后重新提交。", 400);
   }
 
   const paddedCropRect = applyPadding(cropRect, paddingRatio);
@@ -184,7 +189,18 @@ export async function executeBoxCutoutJob(
     })
     .toBuffer();
 
+  logger.info("crop_prepared", {
+    requestId,
+    sourceNodeId: params.sourceNodeId,
+    sourceWidth,
+    sourceHeight,
+    cropRectPixels,
+    paddedCropRectPixels,
+    inputBytes: croppedBuffer.length,
+  });
+
   const result = await executeRmbgJob({
+    requestId,
     userId: params.userId,
     imageBuffer: croppedBuffer,
     imageBase64: croppedBuffer.toString("base64"),

lib/ai/canvas-agent-runtime/image-access-tools.ts

@@ -9,6 +9,7 @@ import {
   summarizeAgentCapabilities,
 } from "./capability-access";
 import type { CanvasAgentTool } from "./loop";
+import { AgentToolRejectedError } from "./protocol";
 import type { CanvasOperationPlan } from "@/types/canvas/agent-protocol";
 
 export function registerImageCanvasAccessTools(params: {
@@ -59,10 +60,10 @@ export function registerImageCanvasAccessTools(params: {
         (item) => item.workspace === "canvas" && item.id === input.featureId,
       );
       if (!feature?.authorized || !feature.id.startsWith("canvas.ui."))
-        throw new Error("请使用清单中的图片画布界面入口，媒体能力请使用对应专用工具");
+        throw new AgentToolRejectedError("请使用清单中的图片画布界面入口，媒体能力请使用对应专用工具；本次未打开面板或提交处理。");
       const { nodes } = await readOwnedCanvas(params.userId, params.projectId);
       if (input.nodeIds.some((nodeId) => !nodes.some((node) => node.id === nodeId)))
-        throw new Error("目标节点不属于当前画布");
+        throw new AgentToolRejectedError("目标节点不属于当前画布，本次未打开面板或提交处理。");
       params.emit("data-canvasAgentUiCommand", {
         projectId: params.projectId,
         requestId: `${params.runId}:${id}`,

lib/ai/canvas-agent-runtime/image-preferences.ts

@@ -13,13 +13,18 @@ export type AgentImageParameters = {
 };
 export type AgentImagePreferences = { modelId?: string; parameters?: AgentImageParameters };
 
+export function selectedAgentImageCount(preferences?: AgentImagePreferences) {
+  const count = preferences?.parameters?.imageCount ?? preferences?.parameters?.n;
+  return count === undefined ? undefined : Math.floor(count);
+}
+
 export function applyAgentImagePreferences<T extends Record<string, unknown>>(
   input: T,
   preferences?: AgentImagePreferences,
 ): T & AgentImageParameters & { modelId?: string } {
   const parameters = Object.fromEntries(Object.entries(preferences?.parameters || {})
     .filter(([, value]) => value !== undefined));
-  const count = preferences?.parameters?.imageCount ?? preferences?.parameters?.n;
+  const count = selectedAgentImageCount(preferences);
   return {
     ...input,
     ...parameters,

lib/ai/canvas-agent-runtime/results.ts

@@ -1,5 +1,14 @@
 import type { AgentCallRecord, AgentRunSnapshot } from "./protocol";
 
+export function countAgentGeneratedImages(calls: AgentCallRecord[]) {
+  return calls.reduce((count, call) => {
+    const output = call.output;
+    if (call.status !== "succeeded" || !output?.appliedImagePreferences ||
+      !Array.isArray(output.createdNodeIds)) return count;
+    return count + output.createdNodeIds.length;
+  }, 0);
+}
+
 // A spontaneous download command is not an unfinished image edit. Keep genuine
 // download requests and all editor panels waiting for their actual interaction.
 export function isAncillaryDownload(snapshot: AgentRunSnapshot, call: AgentCallRecord) {

lib/ai/canvas-agent-runtime/review.ts

@@ -5,7 +5,8 @@ import sharp from "sharp";
 import { z } from "zod";
 import { readCanvasImages, readOwnedCanvas, type RuntimeImageNode } from "./canvas";
 import type { AgentRunSnapshot } from "./protocol";
-import { finalResultNodeIds, originalSourceNodeIds, requiresCanvasInteraction } from "./results";
+import { countAgentGeneratedImages, finalResultNodeIds, originalSourceNodeIds, requiresCanvasInteraction } from "./results";
+import { selectedAgentImageCount } from "./image-preferences";
 import { isCompletedSimpleCutout } from "./cutout-completion";
 
 export async function inspectImageAlpha(source: Buffer) {
@@ -124,14 +125,16 @@ export async function verifyCanvasAgentResults(params: {
     (call) =>
       call.status !== "succeeded" ||
       requiresCanvasInteraction(snapshot, call) ||
-      (typeof call.output?.status === "string" && call.output.status !== "succeeded"),
+      (typeof call.output?.status === "string" && call.output.status !== "succeeded" &&
+        !(call.output.status === "partial" && call.output.appliedImagePreferences)),
   );
   if (incomplete.length) return { passed: false, issues: ["部分操作仍在等待交互或未完成"] };
   const plan = calls.filter((call) => call.name === "planCanvasTask").at(-1)?.output;
   if (!plan) return { passed: false, issues: ["缺少明确的任务验收计划"] };
   // Intermediate images consumed by later write tools do not count as final deliverables.
   const finalIds = finalResultNodeIds(snapshot);
-  const expectedCount = snapshot.requirements?.expectedImageCount ?? plan.expectedImageCount;
+  const expectedCount = snapshot.requirements?.expectedImageCount ?? plan.expectedImageCount ??
+    (countAgentGeneratedImages(calls) > 0 ? selectedAgentImageCount(snapshot.imagePreferences) : undefined);
   if (expectedCount && finalIds.length !== expectedCount) {
     return {
       passed: false,

lib/ai/canvas-agent-runtime/tools.ts

@@ -1,5 +1,11 @@
 import type { AgentVisionExecutor } from "../runtime/agent-vision-failover";
-import { resolveUserImageModel, applyAgentImagePreferences, agentProviderImageParameters, type AgentImagePreferences } from "./image-preferences";
+import {
+  agentProviderImageParameters,
+  applyAgentImagePreferences,
+  resolveUserImageModel,
+  selectedAgentImageCount,
+  type AgentImagePreferences,
+} from "./image-preferences";
 import { tool, type LanguageModel, type ToolSet } from "ai";
 import { z } from "zod";
 import { createCanvasCapabilityTools } from "@/lib/canvas/capabilities/ai-sdk-tools";
@@ -18,6 +24,8 @@ import {
   sortStyleProImageModelEntries,
 } from "@/lib/style-pro/model-options";
 import type { CanvasAgentLoopPorts, CanvasAgentTool } from "./loop";
+import { AgentToolRejectedError, type AgentCallRecord } from "./protocol";
+import { countAgentGeneratedImages } from "./results";
 import { readCanvasImages, readOwnedCanvas } from "./canvas";
 import { analyzeRuntimeImages } from "./review";
 import { isExplicitDestructiveIntent } from "./capability-access";
@@ -37,11 +45,13 @@ export async function buildCanvasRuntimeTools(params: {
   imageSize?: string;
   preferredModelId?: string;
   imagePreferences?: AgentImagePreferences;
+  priorCalls?: AgentCallRecord[];
   emit: (type: string, data: unknown) => void;
   objective?: string;
   operationSelectedNodeIds?: string[];
 }) {
   const { nodes } = await readOwnedCanvas(params.userId, params.projectId);
+  const selectedImageCount = selectedAgentImageCount(params.imagePreferences);
   const imageNodeIds = nodes.filter((node) => node.type === "image").map((node) => node.id);
   const defaults = params.selectedNodeIds.filter((id) => imageNodeIds.includes(id));
   const sdk = await createCanvasCapabilityTools({
@@ -128,8 +138,8 @@ export async function buildCanvasRuntimeTools(params: {
       visualCriteria: z.array(z.string().max(200)).max(10),
     }),
     async (input) => ({ ...input,
-      ...(input.expectedImageCount !== undefined && params.imagePreferences?.parameters?.imageCount !== undefined
+      ...(input.expectedImageCount !== undefined && selectedImageCount !== undefined
-        ? { expectedImageCount: params.imagePreferences.parameters.imageCount } : {}),
+        ? { expectedImageCount: selectedImageCount } : {}),
       ...(params.imagePreferences?.parameters?.aspectRatio && params.imagePreferences.parameters.aspectRatio !== "auto"
         ? { aspectRatio: params.imagePreferences.parameters.aspectRatio } : {}),
     }),
@@ -163,6 +173,8 @@ export async function buildCanvasRuntimeTools(params: {
       };
     },
   );
+  const inspectedImages = new Map<string, Buffer>();
+  let inspectedImageBytes = 0;
   register(
     "analyzeCanvasImages",
     "检查图片",
@@ -171,10 +183,28 @@ export async function buildCanvasRuntimeTools(params: {
       nodeIds: z.array(z.string().min(1).max(180)).min(1).max(4),
       question: z.string().min(1).max(2000),
     }),
-    async (input) => analyzeRuntimeImages({ ...params, ...input }),
+    async (input) => analyzeRuntimeImages({
+      ...params,
+      ...input,
+      reviewPorts: {
+        readImage: async (url) => {
+          const cached = inspectedImages.get(url);
+          if (cached) return cached;
+          const { fetchImageBufferFromUrl } = await import("@/lib/ai/rmbg/service");
+          const original = await fetchImageBufferFromUrl(url);
+          if (!inspectedImages.has(url) && inspectedImageBytes + original.length <= 32 * 1024 * 1024) {
+            inspectedImages.set(url, original);
+            inspectedImageBytes += original.length;
+          }
+          return original;
+        },
+      },
+    }),
   );
 
-  let generatedCount = 0;
+  let submittedCount = 0;
+  let occupiedImageSlots = countAgentGeneratedImages(params.priorCalls ?? []);
+  const countLimitMessage = "本次设定的生成张数已占满，请先查看正在生成或已经生成的结果。";
   register(
     "generateCanvasImages",
     "生成图片",
@@ -189,9 +219,8 @@ export async function buildCanvasRuntimeTools(params: {
     }),
     async (toolInput, callId) => {
       const input = applyAgentImagePreferences(toolInput, params.imagePreferences);
-      // Bound per-task spend without introducing any global/model concurrency queue.
+      if (selectedImageCount !== undefined && occupiedImageSlots >= selectedImageCount)
-      if (generatedCount + input.imageCount > 24)
+        throw new AgentToolRejectedError(countLimitMessage);
-        throw new Error("本次任务已达到 24 张生成预算，请检查结果后继续。");
       const sources = await readCanvasImages(
         params.userId,
         params.projectId,
@@ -214,10 +243,17 @@ export async function buildCanvasRuntimeTools(params: {
       if (!chosen) throw new Error("系统未配置可用的图片生成模型");
       const imageSize = input.imageSize || params.imageSize || "2K";
       const quota = await checkUserImageQuota(params.userId);
-      if (!quota.allowed || (quota.remaining !== null && input.imageCount > quota.remaining))
-        throw new Error("本月图片生成配额不足。");
       const points = await getPointsSystemConfig();
       const user = await getUserById({ id: params.userId });
+      // Reserve the remaining slots before dispatch, including calls still in flight.
+      if (selectedImageCount !== undefined) {
+        input.imageCount = Math.min(input.imageCount, selectedImageCount - occupiedImageSlots);
+        if (input.imageCount < 1) throw new AgentToolRejectedError(countLimitMessage);
+      }
+      if (submittedCount + input.imageCount > 24)
+        throw new AgentToolRejectedError("本次任务已达到 24 张生成预算，请检查结果后继续。");
+      if (!quota.allowed || (quota.remaining !== null && input.imageCount > quota.remaining))
+        throw new Error("本月图片生成配额不足。");
       const cost =
         getModelGenerationCreditCost(
           { imageGenConfig: chosen.model.imageGenConfig as DiscountableImageGenConfigLike | null },
@@ -231,7 +267,8 @@ export async function buildCanvasRuntimeTools(params: {
         (user?.pointsBalance ?? 0) < cost
       )
         throw new Error("积分不足，请充值或联系管理员。");
-      generatedCount += input.imageCount;
+      submittedCount += input.imageCount;
+      occupiedImageSlots += input.imageCount;
       const result = await generateCanvasImage({
         prompt: input.prompt,
         model: chosen.model.id,
@@ -247,6 +284,7 @@ export async function buildCanvasRuntimeTools(params: {
           ? Math.max(0, user?.pointsBalance ?? 0) / input.imageCount : undefined,
         ownerKey: params.userId,
         referenceImages: sources.map((node) => node.data.src || node.data.url!),
+        referenceImageBuffers: inspectedImages,
         debugLabel: "canvas-agent-runtime",
         debugMeta: { runId: params.runId, callId },
       });
@@ -311,6 +349,7 @@ export async function buildCanvasRuntimeTools(params: {
         },
       );
       }
+      occupiedImageSlots += result.images.length - input.imageCount;
       return {
         status: result.images.length < input.imageCount ? "partial" : "succeeded",
         appliedImagePreferences: { modelId: result.modelRef, imageSize, aspectRatio: input.aspectRatio, imageCount: input.imageCount },

lib/ai/canvas-agent-runtime/video-image-functions.ts

@@ -72,6 +72,7 @@ export async function processVideoCanvasImage(
     const result = await executeRmbgJob({
       userId: params.userId,
       imageBuffer: await fetchImageBufferFromUrl(imageUrl),
+      inputImageUrl: imageUrl,
       sourceImageUrl: imageUrl,
       prompt: params.prompt,
     });

lib/ai/detail-replacement-image-model-config.ts

@@ -1,3 +1,5 @@
+import { isVideoModelDescriptor } from "@/lib/ai/model-classification";
+
 export const DETAIL_REPLACEMENT_IMAGE_MODEL_CONFIG_KEY =
   "detail_replacement_image_model_config";
 
@@ -20,3 +22,28 @@ export function normalizeDetailReplacementImageModelConfig(
     modelId: modelId || DEFAULT_DETAIL_REPLACEMENT_IMAGE_MODEL_ID,
   };
 }
+
+export function isDetailReplacementImageModel({
+  model,
+  provider,
+}: {
+  model: { modelId: string; supportsImageGen: boolean; isSubModel: boolean; capabilities?: unknown };
+  provider?: { type?: string | null } | null;
+}) {
+  return model.supportsImageGen && !model.isSubModel && !isVideoModelDescriptor({
+    providerType: provider?.type,
+    modelId: model.modelId,
+    capabilities: model.capabilities,
+    supportsImageGen: model.supportsImageGen,
+  });
+}
+
+export function findConfiguredDetailReplacementImageModel<
+  T extends Parameters<typeof isDetailReplacementImageModel>[0] & { model: { id: string } },
+>(models: T[], setting: unknown): T | undefined {
+  const { modelId } = normalizeDetailReplacementImageModelConfig(setting);
+  return models.find((entry) =>
+    (entry.model.id === modelId || entry.model.modelId === modelId) &&
+    isDetailReplacementImageModel(entry)
+  );
+}

lib/ai/extend/config.ts

@@ -3,6 +3,19 @@ export type ExtendProviderCredential = {
   updatedAt?: Date | string | null;
 };
 
+export type ExtendProvider = "vip98k" | "dashscope" | "fal";
+
+export function resolveFalExtendApiKey(providers: Array<ExtendProviderCredential & { baseUrl?: string | null }>) {
+  for (const { apiKey, baseUrl } of providers) {
+    if (!apiKey || !baseUrl) continue;
+    const url = URL.canParse(baseUrl) ? new URL(baseUrl) : null;
+    if (url?.protocol === "https:" && ["queue.fal.run", "fal.run", "fal.ai", "api.fal.ai"].includes(url.hostname)) {
+      return apiKey.trim().replace(/^(?:Bearer|Key)\s+/i, "");
+    }
+  }
+  return null;
+}
+
 function getUpdatedAtTimestamp(value: Date | string | null | undefined): number {
   if (!value) return 0;
   const timestamp = value instanceof Date ? value.getTime() : Date.parse(value);

lib/ai/extend/fal-outpaint.ts

@@ -0,0 +1,93 @@
+import { createFalClient } from "@fal-ai/client";
+import sharp from "sharp";
+
+export const FAL_OUTPAINT_MODEL = "fal-ai/flux-2-pro/outpaint";
+
+export function getOutpaintGeometry(width: number, height: number, xScale: number, yScale: number) {
+  const targetWidth = Math.round(width * xScale);
+  const targetHeight = Math.round(height * yScale);
+  const ratio = Math.min(1, 2048 / Math.max(targetWidth, targetHeight));
+  const modelWidth = Math.max(1, Math.floor(targetWidth * ratio));
+  const modelHeight = Math.max(1, Math.floor(targetHeight * ratio));
+  const sourceWidth = Math.max(1, Math.round(width * modelWidth / targetWidth));
+  const sourceHeight = Math.max(1, Math.round(height * modelHeight / targetHeight));
+  const left = Math.floor((targetWidth - width) / 2);
+  const top = Math.floor((targetHeight - height) / 2);
+  const modelLeft = Math.round(left * modelWidth / targetWidth);
+  const modelTop = Math.round(top * modelHeight / targetHeight);
+  // Align the model canvas to its 16-pixel grid, then remove the extra border.
+  const extraWidth = (16 - modelWidth % 16) % 16;
+  const extraHeight = (16 - modelHeight % 16) % 16;
+  const cropLeft = Math.floor(extraWidth / 2);
+  const cropTop = Math.floor(extraHeight / 2);
+  return {
+    targetWidth, targetHeight, left, top, modelWidth, modelHeight, sourceWidth, sourceHeight,
+    paddedWidth: modelWidth + extraWidth,
+    paddedHeight: modelHeight + extraHeight,
+    cropLeft,
+    cropTop,
+    expandLeft: modelLeft + cropLeft,
+    expandRight: modelWidth - sourceWidth - modelLeft + extraWidth - cropLeft,
+    expandTop: modelTop + cropTop,
+    expandBottom: modelHeight - sourceHeight - modelTop + extraHeight - cropTop,
+  };
+}
+
+export async function composeOutpaint(source: Buffer, expanded: Buffer, geometry: ReturnType<typeof getOutpaintGeometry>) {
+  const { targetWidth, targetHeight, left, top, modelWidth, modelHeight, paddedWidth, paddedHeight, cropLeft, cropTop } = geometry;
+  const modelImage = sharp(expanded);
+  const info = await modelImage.metadata();
+  if (info.width !== paddedWidth || info.height !== paddedHeight) {
+    throw new Error("扩图服务返回的图片尺寸不正确");
+  }
+
+  // Copy the source rectangle, including transparent pixels, without blending or resizing it.
+  const { data: original, info: sourceInfo } = await sharp(source).toColourspace("srgb").ensureAlpha().raw().toBuffer({ resolveWithObject: true });
+  const result = await modelImage
+    .extract({ left: cropLeft, top: cropTop, width: modelWidth, height: modelHeight })
+    .resize(targetWidth, targetHeight, { fit: "fill" })
+    .toColourspace("srgb").ensureAlpha().raw().toBuffer();
+  const stride = sourceInfo.width * 4;
+  for (let row = 0; row < sourceInfo.height; row++) {
+    original.copy(result, ((top + row) * targetWidth + left) * 4, row * stride, (row + 1) * stride);
+  }
+  return sharp(result, { raw: { width: targetWidth, height: targetHeight, channels: 4 } }).png().toBuffer();
+}
+
+export async function expandWithFalOutpaint({ imageUrl, apiKey, xScale, yScale }: {
+  imageUrl: string;
+  apiKey: string;
+  xScale: number;
+  yScale: number;
+}) {
+  const response = await fetch(imageUrl, { signal: AbortSignal.timeout(45_000) });
+  if (!response.ok) throw new Error("无法读取待扩展的原图");
+  const { data: source, info } = await sharp(Buffer.from(await response.arrayBuffer()))
+    .rotate().png().toBuffer({ resolveWithObject: true });
+  const geometry = getOutpaintGeometry(info.width, info.height, xScale, yScale);
+  if (geometry.targetWidth * geometry.targetHeight > 64_000_000) {
+    throw new Error("扩图后的尺寸过大，请降低扩展倍数");
+  }
+  const fal = createFalClient({ credentials: apiKey });
+  const modelSource = geometry.sourceWidth === info.width && geometry.sourceHeight === info.height
+    ? source
+    : await sharp(source).resize(geometry.sourceWidth, geometry.sourceHeight, { fit: "fill" }).png().toBuffer();
+  const image = await fal.storage.upload(new Blob([new Uint8Array(modelSource)], { type: "image/png" }));
+  const { data } = await fal.subscribe(FAL_OUTPAINT_MODEL, {
+    input: {
+      image_url: image,
+      expand_left: geometry.expandLeft,
+      expand_right: geometry.expandRight,
+      expand_top: geometry.expandTop,
+      expand_bottom: geometry.expandBottom,
+      mode: "high",
+      output_format: "png",
+    },
+    timeout: 90_000,
+  });
+  const outputUrl = (data as { images?: Array<{ url?: string }> }).images?.[0]?.url;
+  if (!outputUrl) throw new Error("扩图服务未返回图片");
+  const output = await fetch(outputUrl, { signal: AbortSignal.timeout(25_000) });
+  if (!output.ok) throw new Error("无法读取扩图结果");
+  return composeOutpaint(source, Buffer.from(await output.arrayBuffer()), geometry);
+}

lib/ai/extend/service.ts

@@ -5,14 +5,15 @@ import {
   getSystemSetting,
   upsertMediaAsset,
 } from "@/lib/db/queries";
-import { resolveAlibabaExtendApiKey } from "@/lib/ai/extend/config";
+import { type ExtendProvider, resolveAlibabaExtendApiKey, resolveFalExtendApiKey } from "@/lib/ai/extend/config";
+import { expandWithFalOutpaint, FAL_OUTPAINT_MODEL } from "@/lib/ai/extend/fal-outpaint";
 import { executeConfiguredVip98kTask } from "@/lib/ai/vip98k-runtime";
 import { db } from "@/lib/db";
 import { generatedImage } from "@/lib/db/schema";
 import { uploadFile } from "@/lib/storage/service";
 
 type ExtendConfig = {
-  provider?: "vip98k" | "dashscope";
+  provider?: ExtendProvider;
   apiKey?: string;
   xScale?: number;
   yScale?: number;
@@ -83,12 +84,12 @@ async function createThumbnail(buffer: Buffer): Promise<Buffer> {
   }
 }
 
-async function uploadBufferPairToS3(buffer: Buffer): Promise<{ thumbnail: string; original: string }> {
+async function uploadBufferPairToS3(buffer: Buffer, originalExtension = "jpg"): Promise<{ thumbnail: string; original: string }> {
   try {
     const timestamp = Date.now();
     const randomStr = Math.random().toString(36).slice(2, 8);
     const thumbnailFilename = `extend-thumb-${timestamp}-${randomStr}.jpg`;
-    const originalFilename = `extend-orig-${timestamp}-${randomStr}.jpg`;
+    const originalFilename = `extend-orig-${timestamp}-${randomStr}.${originalExtension}`;
     const thumbnailBuffer = await createThumbnail(buffer);
     const thumbnailArrayBuffer = thumbnailBuffer.buffer.slice(
       thumbnailBuffer.byteOffset,
@@ -473,6 +474,15 @@ async function getValidatedExtendConfig(): Promise<ExtendConfig> {
   if (config.provider === "vip98k") {
     return config;
   }
+  if (config.provider === "fal") {
+    const [imageProviders, videoProviders] = await Promise.all([
+      getAiProvidersByType({ type: "fal-image", enabledOnly: true }),
+      getAiProvidersByType({ type: "fal-video", enabledOnly: true }),
+    ]);
+    const apiKey = resolveFalExtendApiKey([...imageProviders, ...videoProviders]);
+    if (!apiKey) throw new ExtendServiceError("扩图服务未配置可用的 fal 密钥", 503);
+    return { ...config, apiKey };
+  }
 
   const alibabaProviders = await getAiProvidersByType({
     type: "alibaba-image",
@@ -522,35 +532,29 @@ export async function executeExtendJob(
     throw new ExtendServiceError("无法获取输入图片URL", 400);
   }
 
-  const preparedInputImageUrl =
-    config.provider === "vip98k"
-      ? inputImageUrl
-      : await normalizeDashscopeExpansionInput(inputImageUrl);
   const startTime = Date.now();
-  const extendedImageUrl = await extendImage(
+  let buffer: Buffer;
-    preparedInputImageUrl,
+  let modelId: string;
-    config,
+  if (config.provider === "fal") {
-    xScale,
+    buffer = await expandWithFalOutpaint({ imageUrl: inputImageUrl, apiKey: config.apiKey!, xScale, yScale });
-    yScale,
+    modelId = FAL_OUTPAINT_MODEL;
-    requestId,
+  } else {
-  );
+    const prepared = config.provider === "vip98k" ? inputImageUrl : await normalizeDashscopeExpansionInput(inputImageUrl);
-  const imageResponse = await fetch(extendedImageUrl);
+    const url = await extendImage(prepared, config, xScale, yScale, requestId);
+    const imageResponse = await fetch(url);
     if (!imageResponse.ok) {
-    throw new ExtendServiceError(
+      throw new ExtendServiceError("下载拓展图片失败", 500, `${imageResponse.status} ${imageResponse.statusText}`);
-      "下载拓展图片失败",
+    }
-      500,
+    buffer = Buffer.from(await imageResponse.arrayBuffer());
-      `${imageResponse.status} ${imageResponse.statusText}`,
+    modelId = config.provider === "vip98k" ? "image-expansion" : "extend-1.0";
-    );
   }
-
-  const buffer = Buffer.from(await imageResponse.arrayBuffer());
   const imageBase64Result = includeBase64 ? buffer.toString("base64") : undefined;
-  const uploadResult = await uploadBufferPairToS3(buffer);
+  const uploadResult = await uploadBufferPairToS3(buffer, config.provider === "fal" ? "png" : "jpg");
   console.log("[Extend Service] Result uploaded:", {
     requestId,
     includeBase64,
     inputImageUrl: inputImageUrl.slice(0, 120),
-    extendedImageUrl: extendedImageUrl.slice(0, 120),
+    modelId,
     outputBytes: buffer.length,
   });
   let mediaAssetId: string | null = null;
@@ -567,7 +571,7 @@ export async function executeExtendJob(
           thumbnailUrl: uploadResult.thumbnail,
           originalUrl: uploadResult.original,
           prompt,
-          modelId: config.provider === "vip98k" ? "image-expansion" : "extend-1.0",
+          modelId,
           imageSize: "2K",
         })
         .returning();
@@ -591,7 +595,7 @@ export async function executeExtendJob(
         thumbnailUrl: uploadResult.thumbnail,
         displayName: prompt.slice(0, 80),
         prompt,
-        modelId: config.provider === "vip98k" ? "image-expansion" : "extend-1.0",
+        modelId,
         sourceMessageId: messageId,
         sourceTable: "GeneratedImage",
         sourceRowId: generatedImageId,

lib/ai/providers/alibaba-image.ts

@@ -5,15 +5,17 @@
  * - qwen-image-edit-plus 系列：支持 1-6 张输出，自定义分辨率，提示词优化
  * - qwen-image-edit：仅支持 1 张输出
  * 
- * API 文档：https://help.aliyun.com/zh/model-studio/developer-reference/qwen-vl-plus
+ * API 文档：https://help.aliyun.com/en/model-studio/qwen-image-generation-and-editing-api-reference
  */
 
 import sharp from "sharp";
 import { constrainImageDimensions } from "@/lib/ai/image-size-constraints";
 import { isAlibabaImageTextToImageModelId } from "@/lib/ai/model-classification";
 import { buildReferenceImageOrderPrompt } from "@/lib/ai/providers/reference-image-order";
+import { ImageReferenceReadTimeoutError } from "@/lib/ai/runtime/image-generation-error";
 import { createDeferredUploadedImage } from "@/lib/storage/image-archive";
 import { uploadFile } from "@/lib/storage/service";
+import { normalizeLegacyAliyunStorageUrl } from "@/lib/storage/retired-storage";
 import {
   isAlibabaQwenImage3ModelId,
   resolveAlibabaImageAsyncEndpoint,
@@ -46,6 +48,8 @@ interface AlibabaImageResponse {
   output?: {
     task_id?: string;
     task_status?: string;
+    code?: string;
+    message?: string;
     choices?: Array<{
       finish_reason: string;
       message: {
@@ -122,11 +126,21 @@ async function fetchImageBufferWithRetry(
   timeoutMs = ALIBABA_IMAGE_FETCH_TIMEOUT_MS,
   attempts = 2
 ): Promise<{ buffer: Buffer; contentType: string | null }> {
+  if (imageUrl.startsWith("data:image/")) {
+    const match = imageUrl.match(/^data:(image\/[a-z0-9.+-]+);base64,(.+)$/i);
+    if (!match) throw new Error("输入图片数据格式无效");
+    return { buffer: Buffer.from(match[2], "base64"), contentType: match[1] };
+  }
+  let sourceUrl = imageUrl;
+  if (normalizeLegacyAliyunStorageUrl(sourceUrl)) {
+    const { resolveLegacyAliyunStorageUrl } = await import("@/lib/storage/image-archive-db");
+    sourceUrl = await resolveLegacyAliyunStorageUrl(sourceUrl);
+  }
   let lastError: unknown = null;
   for (let attempt = 1; attempt <= attempts; attempt += 1) {
     const ctx = createAbortSignal(timeoutMs);
     try {
-      const response = await fetch(imageUrl, {
+      const response = await fetch(sourceUrl, {
         cache: "no-store",
         redirect: "follow",
         signal: ctx.signal,
@@ -152,7 +166,7 @@ async function fetchImageBufferWithRetry(
     }
   }
 
-  throw lastError instanceof Error ? lastError : new Error(String(lastError || "下载图片失败"));
+  throw lastError ?? new Error("下载图片失败");
 }
 
 function calculateAlibabaSizeByAspect(aspectValue: number, baseSize: number): string {
@@ -168,7 +182,7 @@ function calculateAlibabaSizeByAspect(aspectValue: number, baseSize: number): st
 }
 
 async function inferAspectRatioFromImageUrl(imageUrl: string): Promise<number | null> {
-  if (!/^https?:\/\//i.test(imageUrl)) return null;
+  if (!/^(?:https?:\/\/|data:image\/)/i.test(imageUrl)) return null;
 
   try {
     const { buffer } = await fetchImageBufferWithRetry(imageUrl);
@@ -186,7 +200,7 @@ async function inferAspectRatioFromImageUrl(imageUrl: string): Promise<number |
 async function inferImageDimensionsFromImageUrl(
   imageUrl: string,
 ): Promise<{ width: number; height: number; aspectRatio: number } | null> {
-  if (!/^https?:\/\//i.test(imageUrl)) return null;
+  if (!/^(?:https?:\/\/|data:image\/)/i.test(imageUrl)) return null;
 
   try {
     const { buffer } = await fetchImageBufferWithRetry(imageUrl);
@@ -276,12 +290,20 @@ async function prepareAlibabaInputImageUrl(
   imageUrl: string,
   modelId: string,
   inputRole?: AlibabaImageInputRole,
+  original?: Buffer,
 ): Promise<string> {
   const normalizedUrl = String(imageUrl || "").trim();
   if (!/^https?:\/\//i.test(normalizedUrl)) return normalizedUrl;
 
   const maxInputBytes = getAlibabaMaxInputBytes(modelId);
-  const { buffer, contentType } = await fetchImageBufferWithRetry(normalizedUrl);
+  const { buffer, contentType } = original
+    ? { buffer: original, contentType: null }
+    : await fetchImageBufferWithRetry(normalizedUrl).catch((error) => {
+        if (["AbortError", "TimeoutError"].includes(error?.name)) {
+          throw new ImageReferenceReadTimeoutError();
+        }
+        throw error;
+      });
   let metadata: sharp.Metadata;
   try {
     metadata = await sharp(buffer, { failOn: "none" }).metadata();
@@ -302,6 +324,14 @@ async function prepareAlibabaInputImageUrl(
     maxSide: ALIBABA_MAX_INPUT_SIDE,
     modelId,
   });
+  if (isAlibabaQwenImage3ModelId(modelId)) {
+    if (prepared.buffer.length > maxInputBytes) {
+      throw new Error("输入图片超过模型大小限制，请先压缩图片后重试");
+    }
+    const format = prepared.transformed ? prepared.extension : metadata.format;
+    const mime = format === "jpg" || format === "jpeg" ? "image/jpeg" : `image/${format}`;
+    return `data:${mime};base64,${prepared.buffer.toString("base64")}`;
+  }
   if (!prepared.transformed) {
     return normalizedUrl;
   }
@@ -540,7 +570,7 @@ async function sendAlibabaImageAsyncRequest(params: {
     url: params.requestURL,
   });
   const taskId = String(submitted.output?.task_id || "").trim();
-  if (!taskId) throw new Error("阿里图片异步任务未返回 task_id");
+  if (!taskId) throw new Error("阿里图片异步任务未返回 task_id，结果尚未确认");
 
   const taskURL = resolveAlibabaImageTaskEndpoint(params.requestURL, taskId);
   const startedAt = Date.now();
@@ -564,9 +594,11 @@ async function sendAlibabaImageAsyncRequest(params: {
         console.log("[Alibaba Image] Async task completed:", taskId);
         return task;
       }
-      if (["FAILED", "CANCELED", "UNKNOWN"].includes(taskStatus)) {
+      if (["FAILED", "CANCELED"].includes(taskStatus)) {
+        const reason = task.output?.message || task.message || `阿里图片任务${taskStatus || "失败"}`;
+        const code = task.output?.code || task.code;
         throw new AlibabaImageTerminalTaskError(
-          task.message || `阿里图片任务${taskStatus || "失败"}（task_id: ${taskId}）`,
+          `${reason}${code ? `（${code}）` : ""}（task_id: ${taskId}）`,
         );
       }
       lastPollError = null;
@@ -578,7 +610,7 @@ async function sendAlibabaImageAsyncRequest(params: {
         error.status < 500 &&
         ![408, 425, 429].includes(error.status)
       ) {
-        throw error;
+        throw new Error(`阿里图片任务已提交，结果尚未确认（task_id: ${taskId}）`, { cause: error });
       }
       lastPollError = error;
       console.warn("[Alibaba Image] Async task poll failed; retrying:", {
@@ -700,6 +732,7 @@ export function createAlibabaImage({ apiKey, baseURL }: AlibabaImageConfig) {
       doGenerate: async (options: {
         messages: Array<{ role: string; content: string | Array<{ type: string; text?: string; image?: string }> }>;
         imageParams?: AlibabaImageParams & { aspectRatio?: string; imageSize?: string; imageCount?: number };
+        referenceImageBuffers?: ReadonlyMap<string, Buffer>;
         modelDisplayName?: string; // 🆕 模型显示名称，用于错误提示
         overrideModelId?: string; // 🆕 备用模型 ID
       }) => {
@@ -775,6 +808,7 @@ export function createAlibabaImage({ apiKey, baseURL }: AlibabaImageConfig) {
                 imageUrl,
                 activeModelId,
                 options.imageParams?.inputImageRoleByUrl?.[imageUrl],
+                options.referenceImageBuffers?.get(imageUrl),
               ),
             ),
           );
@@ -915,7 +949,9 @@ export function createAlibabaImage({ apiKey, baseURL }: AlibabaImageConfig) {
           );
           
           // 处理响应
-          const images = await processResponse(response);
+          const images = await processResponse(response).catch((error) => {
+            throw new Error("阿里图片任务已提交，结果尚未确认。", { cause: error });
+          });
           const markdownText = formatImageResponse(images, params.size, imageSize);
           
           console.log(`[Alibaba Image] Generated ${images.length} images successfully`);

lib/ai/providers/vip98k.ts

@@ -1647,6 +1647,15 @@ export function buildTaskBody(params: Vip98kTaskParams, invocation: Vip98kInvoca
   if (params.modelId.toLowerCase() === "image-expansion") {
     bindVip98kExpansionParams(body, imageParams);
   }
+  if (params.kind === "image-tool" && params.modelId.toLowerCase() === "ocr") {
+    // Old synced examples include generic image fields and both language aliases.
+    const metadata = toRecord(body.metadata);
+    const language = String(metadata?.language || body.language || "").trim();
+    body.metadata = { language: language || "English,ChinesePRC,Digits" };
+    body.output_format = "txt";
+    delete body.language;
+    delete body.size;
+  }
   const imageBindingKeys = bindVip98kImages(body, params.imageUrls);
   if (params.imageUrls.length > 0 && !invocation && imageBindingKeys.length === 0) {
     body.images = params.imageUrls;

lib/ai/rmbg/service.ts

@@ -8,6 +8,7 @@ import { executeConfiguredVip98kTask } from "@/lib/ai/vip98k-runtime";
 import { db } from "@/lib/db";
 import { generatedImage } from "@/lib/db/schema";
 import { createLogger } from "@/lib/observability/logger";
+import { trackRuntimeWork } from "@/lib/observability/active-work";
 import { uploadFile } from "@/lib/storage/service";
 
 const logger = createLogger("rmbg-service");
@@ -27,6 +28,7 @@ type RmbgConfig = {
 };
 
 export type ExecuteRmbgJobParams = {
+  requestId?: string;
   userId: string;
   imageBuffer: Buffer;
   imageBase64?: string;
@@ -35,6 +37,8 @@ export type ExecuteRmbgJobParams = {
   chatId?: string | null;
   messageId?: string | null;
   skipGallerySave?: boolean;
+  // 仅当 imageBuffer 与 URL 对应的输入文件一致时提供。
+  inputImageUrl?: string | null;
   sourceImageUrl?: string | null;
 };
 
@@ -53,7 +57,7 @@ export class RmbgServiceError extends Error {
   detail?: string;
 
   constructor(message: string, status = 500, detail?: string) {
-    super(message);
+    super(detail && detail !== message ? `${message}：${detail}` : message);
     this.name = "RmbgServiceError";
     this.status = status;
     this.detail = detail;
@@ -61,7 +65,11 @@ export class RmbgServiceError extends Error {
 }
 
 const sleep = (ms: number) => new Promise((resolve) => setTimeout(resolve, ms));
+// https://picwish.cn/background-removal-api-doc
 const AOS_MAX_RESOLUTION = 4096;
+const AOS_MAX_INPUT_BYTES = 50 * 1024 * 1024;
+// The shared AOS state -5 documents a separate limit for image_url downloads.
+const AOS_MAX_URL_INPUT_BYTES = 30 * 1024 * 1024;
 const AOS_CREATE_TIMEOUT_MS = 120_000;
 const AOS_POLL_TIMEOUT_MS = 60_000;
 const AOS_DOWNLOAD_TIMEOUT_MS = 60_000;
@@ -147,6 +155,18 @@ const withTimeout = async <T,>(
   }
 };
 
+async function readAosResult<T>(read: (signal: AbortSignal) => Promise<T>, timeoutMs: number): Promise<T> {
+  for (let attempt = 0; ; attempt++) {
+    try {
+      return await withTimeout(read, timeoutMs);
+    } catch (error) {
+      const name = error instanceof Error ? error.name : "";
+      if (attempt >= 2 || (name !== "TypeError" && name !== "AbortError")) throw error;
+      await sleep(1000 * (attempt + 1));
+    }
+  }
+}
+
 function getAosFriendlyErrorMessage(detail: string): string | null {
   const resolutionMatch = detail.match(/resolution excess,\s*width=(\d+),\s*height=(\d+)/i);
   if (resolutionMatch) {
@@ -164,52 +184,44 @@ function getAosFriendlyErrorMessage(detail: string): string | null {
 async function prepareImageForAos(
   imageBuffer: Buffer
 ): Promise<{ buffer: Buffer; mimeType: string; filename: string }> {
+  if (imageBuffer.length > AOS_MAX_INPUT_BYTES) {
+    throw new RmbgServiceError(
+      `抠图参考图文件大小超限（${(imageBuffer.length / 1024 / 1024).toFixed(2)} MB），当前 AOS 上游最大支持 50 MB。`,
+      400
+    );
+  }
+
+  let metadata: import("sharp").Metadata;
   try {
     const sharp = await import("sharp");
-    const image = sharp.default(imageBuffer);
+    metadata = await sharp.default(imageBuffer, { limitInputPixels: false }).metadata();
-    const metadata = await image.metadata();
+  } catch (error) {
-    const width = metadata.width;
+    // AOS also accepts BMP/RAW/RGB formats that Sharp cannot identify.
-    const height = metadata.height;
+    logger.warn("aos_image_metadata_unavailable", error);
-    const format = (metadata.format || "png").toLowerCase();
+    return { buffer: imageBuffer, mimeType: "application/octet-stream", filename: "image" };
+  }
 
+  const { width, height } = metadata;
+  if (width && height && (width > AOS_MAX_RESOLUTION || height > AOS_MAX_RESOLUTION)) {
+    throw new RmbgServiceError(
+      `抠图参考图分辨率超限（${width}×${height} 像素），当前 AOS 上游要求宽、高均不超过 ${AOS_MAX_RESOLUTION} 像素。`,
+      400
+    );
+  }
+
+  const format = metadata.format || "";
+  if (["gif", "svg", "heif", "avif", "jp2", "jxl"].includes(format)) {
+    const name = format === "heif" ? "HEIF/AVIF" : format.toUpperCase();
+    throw new RmbgServiceError(`抠图参考图格式不支持（${name}），当前 AOS 上游不支持此格式。`, 400);
+  }
   const ext = format === "jpeg" ? "jpg" : format;
-    const filenameExt =
-      ext === "jpg" || ext === "png" || ext === "webp" || ext === "tiff" ? ext : "png";
-    const mimeType =
-      ext === "jpg"
-        ? "image/jpeg"
-        : ext === "webp"
-          ? "image/webp"
-          : ext === "tiff"
-            ? "image/tiff"
-            : "image/png";
-
-    if (!width || !height || (width <= AOS_MAX_RESOLUTION && height <= AOS_MAX_RESOLUTION)) {
   return {
     buffer: imageBuffer,
-        mimeType,
+    mimeType: format ? `image/${format}` : "application/octet-stream",
-        filename: `image.${filenameExt}`,
+    filename: ext ? `image.${ext}` : "image",
   };
 }
 
-    const resizedBuffer = await image
-      .resize(AOS_MAX_RESOLUTION, AOS_MAX_RESOLUTION, {
-        fit: "inside",
-        withoutEnlargement: true,
-      })
-      .toBuffer();
-
-    return {
-      buffer: resizedBuffer,
-      mimeType,
-      filename: `image.${filenameExt}`,
-    };
-  } catch (error) {
-    logger.warn("aos_image_preprocess_failed", error);
-    return { buffer: imageBuffer, mimeType: "image/png", filename: "image.png" };
-  }
-}
-
 async function processWithRMBG(
   imageBase64: string,
   config: { apiUrl: string; apiKey?: string }
@@ -369,20 +381,38 @@ async function processWithAosSegmentation(
     foregroundType?: "" | "person" | "object" | "stamp";
     crop?: 0 | 1;
     format?: "png" | "jpg";
+    inputImageUrl?: string | null;
+    requestId?: string;
   }
 ): Promise<{ success: boolean; imageBuffer?: Buffer; processing_time?: number; error?: string }> {
   const startTime = Date.now();
   const baseUrl = (config.apiBaseUrl || "https://techsz.aoscdn.com").replace(/\/+$/, "");
   const createUrl = `${baseUrl}/api/tasks/visual/segmentation`;
   const headers = { "X-API-KEY": config.apiKey };
+  let stage = "create";
+  let providerTaskId: string | undefined;
+  const sourceImage = await prepareImageForAos(imageBuffer);
 
   try {
-    const normalizedImage = await prepareImageForAos(imageBuffer);
     const createForm = new FormData();
-    const imageBlob = new Blob([new Uint8Array(normalizedImage.buffer)], {
+    let publicSourceUrl: string | null = null;
-      type: normalizedImage.mimeType,
+    if (config.inputImageUrl && imageBuffer.length <= AOS_MAX_URL_INPUT_BYTES) {
+      try {
+        const source = new URL(config.inputImageUrl);
+        const cdn = new URL(process.env.NEXT_PUBLIC_CANVAS_CDN_ORIGIN || "");
+        if (["http:", "https:"].includes(source.protocol) && source.hostname === cdn.hostname) {
+          publicSourceUrl = source.toString();
+        }
+      } catch { /* Uploaded files and other sources use the file API. */ }
+    }
+    if (publicSourceUrl) {
+      createForm.append("image_url", publicSourceUrl);
+    } else {
+      const imageBlob = new Blob([new Uint8Array(sourceImage.buffer)], {
+        type: sourceImage.mimeType,
       });
-    createForm.append("image_file", imageBlob, normalizedImage.filename);
+      createForm.append("image_file", imageBlob, sourceImage.filename);
+    }
     createForm.append("sync", "0");
     createForm.append("return_type", "1");
     createForm.append("output_type", "2");
@@ -392,6 +422,9 @@ async function processWithAosSegmentation(
       createForm.append("type", config.foregroundType);
     }
 
+    const createStartedAt = Date.now();
+    logger.info("aos_task_create_started", { requestId: config.requestId, sourceMode: publicSourceUrl ? "url" : "file", inputBytes: imageBuffer.length, uploadBytes: publicSourceUrl ? 0 : sourceImage.buffer.length });
+
     const createResponse = await withTimeout(
       (signal) =>
         fetch(createUrl, {
@@ -411,28 +444,37 @@ async function processWithAosSegmentation(
       });
       return {
         success: false,
-        error: `AOS任务创建失败: ${createPayload?.message || createResponse.statusText}`,
+        error: `AOS任务创建失败（HTTP ${createResponse.status}）: ${createPayload?.message || createResponse.statusText}`,
       };
     }
 
     const taskId = createPayload.data.task_id as string;
+    providerTaskId = taskId;
+    logger.info("aos_task_created", { requestId: config.requestId, taskId, createMs: Date.now() - createStartedAt });
     const taskUrl = `${createUrl}/${taskId}`;
     const maxPollCount = 60;
 
     for (let pollCount = 0; pollCount < maxPollCount; pollCount += 1) {
       await sleep(1000);
+      stage = "poll";
 
-      const pollResponse = await withTimeout(
+      const pollResponse = await readAosResult(
-        (signal) =>
+        async (signal) => {
-          fetch(taskUrl, {
+          const response = await fetch(taskUrl, {
             method: "GET",
             headers,
             signal,
-          }),
+          });
+          const payload = await response.json().catch((error) => {
+            if (error instanceof Error && error.name !== "SyntaxError") throw error;
+            return null;
+          });
+          return { ok: response.ok, status: response.status, statusText: response.statusText, payload };
+        },
         AOS_POLL_TIMEOUT_MS
       );
 
-      const pollPayload = await pollResponse.json().catch(() => null);
+      const pollPayload = pollResponse.payload;
       if (!pollResponse.ok || !pollPayload?.data) {
         logger.warn("aos_task_poll_failed", {
           hasPayload: pollPayload != null,
@@ -440,7 +482,7 @@ async function processWithAosSegmentation(
         });
         return {
           success: false,
-          error: `AOS任务查询失败: ${pollPayload?.message || pollResponse.statusText}`,
+          error: `AOS任务查询失败（HTTP ${pollResponse.status}，任务 ${taskId}）: ${pollPayload?.message || pollResponse.statusText}`,
         };
       }
 
@@ -454,12 +496,15 @@ async function processWithAosSegmentation(
           pollCount,
           taskId,
         });
-        const imageResponse = await withTimeout(
+        stage = "download";
-          (signal) =>
+        const imageResponse = await readAosResult(
-            fetch(imageUrl, {
+          async (signal) => {
+            const response = await fetch(imageUrl, {
               method: "GET",
               signal,
-            }),
+            });
+            return { ok: response.ok, status: response.status, statusText: response.statusText, buffer: response.ok ? Buffer.from(await response.arrayBuffer()) : null };
+          },
           AOS_DOWNLOAD_TIMEOUT_MS
         );
 
@@ -470,11 +515,11 @@ async function processWithAosSegmentation(
           });
           return {
             success: false,
-            error: `AOS结果下载失败: ${imageResponse.status} ${imageResponse.statusText}`,
+            error: `AOS结果下载失败（HTTP ${imageResponse.status}，任务 ${taskId}）: ${imageResponse.statusText}`,
           };
         }
 
-        const resultBuffer = Buffer.from(await imageResponse.arrayBuffer());
+        const resultBuffer = imageResponse.buffer!;
         return {
           success: true,
           imageBuffer: resultBuffer,
@@ -490,19 +535,30 @@ async function processWithAosSegmentation(
         });
         return {
           success: false,
-          error: `AOS任务失败: ${errMessage || stateDetail || pollPayload?.message || "状态异常"}`,
+          error: `AOS任务失败（状态 ${state}，任务 ${taskId}）: ${errMessage || stateDetail || pollPayload?.message || "未提供详情"}`,
         };
       }
     }
 
-    logger.warn("aos_task_timeout", { maxPollCount });
+    logger.warn("aos_task_timeout", { requestId: config.requestId, taskId, maxPollCount });
-    return { success: false, error: "AOS任务超时（最多60秒）" };
+    return { success: false, error: `AOS查询任务超时，结果尚未确认（任务 ${taskId}）` };
   } catch (error) {
     if (error instanceof Error && error.name === "AbortError") {
-      return { success: false, error: "AOS请求超时，请稍后重试" };
+      logger.warn("aos_request_timeout", { requestId: config.requestId, stage, taskId: providerTaskId, inputBytes: imageBuffer.length });
+      const message = stage === "create"
+        ? "AOS创建任务超时（120秒），结果尚未确认"
+        : stage === "poll"
+          ? `AOS查询任务超时，结果尚未确认（任务 ${providerTaskId}）`
+          : `AOS结果下载超时，任务已完成（任务 ${providerTaskId}）`;
+      return { success: false, error: message };
     }
-    logger.warn("aos_provider_request_error", error);
+    logger.warn("aos_provider_request_error", error, { requestId: config.requestId, stage, taskId: providerTaskId });
-    return { success: false, error: error instanceof Error ? error.message : "未知错误" };
+    const detail = error instanceof Error ? error.message : "未知错误";
+    return { success: false, error: stage === "create"
+      ? `AOS创建任务连接失败，结果尚未确认：${detail}`
+      : stage === "poll"
+        ? `AOS查询任务连接失败，结果尚未确认（任务 ${providerTaskId}）：${detail}`
+        : `AOS结果下载连接失败，任务已完成（任务 ${providerTaskId}）：${detail}` };
   }
 }
 
@@ -599,8 +655,15 @@ export async function fetchImageBufferFromUrl(imageUrl: string): Promise<Buffer>
 
 export async function executeRmbgJob(
   params: ExecuteRmbgJobParams
+): Promise<ExecuteRmbgJobResult> {
+  return trackRuntimeWork(() => runRmbgJob(params));
+}
+
+async function runRmbgJob(
+  params: ExecuteRmbgJobParams
 ): Promise<ExecuteRmbgJobResult> {
   const {
+    requestId = crypto.randomUUID(),
     userId,
     imageBuffer,
     imageBase64 = imageBuffer.toString("base64"),
@@ -609,11 +672,13 @@ export async function executeRmbgJob(
     chatId = null,
     messageId = null,
     skipGallerySave = false,
+    inputImageUrl = null,
     sourceImageUrl = null,
   } = params;
 
   const { provider, config } = await getValidatedRmbgConfig();
   logger.info("job_started", {
+    requestId,
     hasChatId: Boolean(chatId),
     hasMessageId: Boolean(messageId),
     hasSourceImageUrl: Boolean(sourceImageUrl),
@@ -657,6 +722,8 @@ export async function executeRmbgJob(
       foregroundType: foregroundType ?? config.aosForegroundType ?? "",
       crop: config.aosCrop === 1 ? 1 : 0,
       format: config.aosFormat === "jpg" ? "jpg" : "png",
+      inputImageUrl,
+      requestId,
     });
 
     if (!result.success || !result.imageBuffer) {
@@ -793,6 +860,7 @@ export async function executeRmbgJob(
       }
 
       logger.info("job_completed", {
+        requestId,
         generatedImageId: savedImage.id,
         mediaAssetId,
         processingSeconds: Number(processingTime.toFixed(2)),
@@ -815,6 +883,7 @@ export async function executeRmbgJob(
   }
 
   logger.info("job_completed", {
+    requestId,
     processingSeconds: Number(processingTime.toFixed(2)),
     provider,
     savedToGallery: false,

lib/ai/runtime/agent-image-failover.ts

@@ -3,6 +3,7 @@ import { agentModelFault, type AgentModelFault } from "./agent-model-failover";
 export function agentImageFailurePolicy(error: unknown): { retry: boolean; pause: AgentModelFault | null } {
   const value = error as { message?: string; providerOutcomeUnknown?: boolean; status?: number; statusCode?: number } | null;
   const message = String(value?.message || "").toLowerCase();
+  if (value?.providerOutcomeUnknown || ["AbortError", "TimeoutError"].includes(String((error as { name?: string })?.name || ""))) return { retry: false, pause: null };
   // A submitted image job may still succeed. Retain its task and reconcile it;
   // never submit another paid job just because a poll/connection timed out.
   const unknown = value?.providerOutcomeUnknown || /request_outcome_unknown|may still be running|outcome.unknown|timed out|timeout|超时|fetch failed|econnreset|socket hang up/.test(message);

lib/ai/runtime/direct-agent-image-edit-executor.ts

@@ -516,6 +516,7 @@ export async function executeDirectAgentImageEditTool(
     const result = await executeRmbgJob({
       userId: params.userId,
       imageBuffer: sourceBuffer,
+      inputImageUrl: params.sourceImageUrl,
       prompt: params.requestTextContent || "抠图处理",
       chatId: params.chatId,
       messageId: params.messageId,

lib/ai/runtime/image-generation-error.ts

@@ -8,6 +8,12 @@ export class AgentImageGenerationError extends Error {
   constructor(message: string, readonly confirmedNoResult: boolean) { super(message); }
 }
 
+export class ImageReferenceReadTimeoutError extends AgentImageGenerationError {
+  constructor() {
+    super("提交生图前读取参考图超时，任务尚未提交，可以稍后重试。", true);
+  }
+}
+
 /** Preserve outcome evidence when replacing upstream diagnostics with safe UI text. */
 export function agentImageGenerationError(error: unknown, mode: "auto" | "pinned") {
   const rejected = error instanceof ImageSubmissionRejectedError;

lib/ai/runtime/model-health.ts

@@ -13,7 +13,7 @@ import {
   isMediaInputFailure,
   isNonProviderRequestStatus,
 } from "@/lib/ai/runtime/request-failure-classification";
-import { isGatewayResponseTimeout, isProviderBalanceError, isRateLimitError } from "@/lib/request-error";
+import { getRequestFailureDetails, isGatewayResponseTimeout, isProviderBalanceError, isRateLimitError } from "@/lib/request-error";
 
 export type AiModelHealthEventType =
   | "success"
@@ -344,7 +344,12 @@ export function classifyAiModelHealthFailure(error: unknown): {
 }
 
 export function shouldFailoverAiModelError(error: unknown) {
-  if (error instanceof ProviderTaskUncertainError || isGatewayResponseTimeout(error)) return false;
+  if (
+    error instanceof ProviderTaskUncertainError ||
+    isGatewayResponseTimeout(error) ||
+    getRequestFailureDetails(error).outcome === "unknown" ||
+    ["AbortError", "TimeoutError"].includes(String((error as { name?: string })?.name || ""))
+  ) return false;
   const classification = classifyAiModelHealthFailure(error);
   const normalized = getErrorMessage(error).toLowerCase();
   const imageProviderTaskFailed =

lib/ai/vip98k-models.ts

@@ -143,6 +143,7 @@ const IMAGE_TOOL_MODEL_IDS = new Set([
   "id-photo",
   "image-expansion",
   "image-upscaler",
+  "ocr",
   "photo-cleanup",
   "remove-background",
   "remove-object",
@@ -1041,6 +1042,7 @@ function createToolPreset(
   const inputModes = getInputModes(model);
   const outputModes = getOutputModes(model);
   const isImageTool = type === "image_tool";
+  const isOcr = modelId.toLowerCase() === "ocr";
   const toolOperation = IMAGE_TOOL_OPERATION_BY_MODEL_ID[modelId.toLowerCase()] || type;
 
   return {
@@ -1056,7 +1058,7 @@ function createToolPreset(
       kind: type.replace(/_/g, "-"),
       mediaType: isImageTool ? "image" : type === "audio" ? "audio" : "document",
       modelType: type,
-      outputType: outputModes[0] || (isImageTool ? "image" : "text"),
+      outputType: isOcr ? "text" : outputModes[0] || (isImageTool ? "image" : "text"),
       inputModes,
       outputModes,
       supportedModes: getCapabilities(model),

lib/ai/zcode-agent/task.ts

@@ -4,9 +4,11 @@ import { join } from "node:path";
 import type { NativeEvent, NativeResult } from "@/services/zcode-agent/runner.mjs";
 import { runNativeZcode } from "./native-runtime";
 import type { CanvasAgentTool } from "@/lib/ai/canvas-agent-runtime/loop";
-import { AgentToolRejectedError, publicAgentError, type AgentRunSnapshot, type CanvasAgentRunStatus } from "@/lib/ai/canvas-agent-runtime/protocol";
+import { AgentToolRejectedError, publicAgentError, type AgentCallRecord, type AgentRunSnapshot, type CanvasAgentRunStatus } from "@/lib/ai/canvas-agent-runtime/protocol";
+import { formatRequestFailure, getRequestFailureDetails } from "@/lib/request-error";
 import { isCompletedSimpleCutout } from "@/lib/ai/canvas-agent-runtime/cutout-completion";
-import { requiresCanvasInteraction } from "@/lib/ai/canvas-agent-runtime/results";
+import { countAgentGeneratedImages, requiresCanvasInteraction } from "@/lib/ai/canvas-agent-runtime/results";
+import { selectedAgentImageCount } from "@/lib/ai/canvas-agent-runtime/image-preferences";
 import { AgentImageGenerationError } from "@/lib/ai/runtime/image-generation-error";
 import { publicAssistantText } from "./assistant-output";
 
@@ -37,6 +39,27 @@ export async function runZcodeCanvasTask(ports: Ports): Promise<CanvasAgentRunSt
     snapshot.message = message;
     await ports.checkpoint(structuredClone(snapshot), status); return status;
   }
+  function failureMessage(call: AgentCallRecord) {
+    if (call.confirmedNoResult) return `${call.error}\n\n请求编号：${ports.runId}`;
+    const details = getRequestFailureDetails(call.error || "任务结果尚未确认");
+    if (call.uncertain || call.status === "started") {
+      if (details.outcome !== "unknown") details.message += "结果尚未确认。";
+      details.outcome = "unknown";
+      details.recommendation = "请联系管理员按请求编号核对原任务结果；不要换模型、新建对话或重新提交，以免重复生成。";
+    }
+    if (!details.recommendation) details.recommendation = "请联系管理员并提供请求编号，核对该步骤的错误。";
+    return `${call.title || "创作工具"}：${formatRequestFailure(details, ports.runId)}`;
+  }
+  function imageCountReached() {
+    const count = snapshot.workspace === "video" ? undefined : selectedAgentImageCount(snapshot.imagePreferences);
+    return count !== undefined && countAgentGeneratedImages(snapshot.calls) >= count;
+  }
+  function reviewMessage(issues: string[]) {
+    const summary = `结果待核对：${issues.join("；")}`;
+    return imageCountReached()
+      ? `${summary}\n\n已保留本次生成的图片。如需再生成，请发送新指令。`
+      : summary;
+  }
   let modelError = "";
   let toolFailure = "";
   let nativeFailed = false;
@@ -44,11 +67,11 @@ export async function runZcodeCanvasTask(ports: Ports): Promise<CanvasAgentRunSt
   const seenTextEvents = new Set<string>();
   let lastTextMessage = "";
   async function appendText(delta: string) {
-    delta = publicAssistantText(delta).slice(0, Math.max(0, 100_000 - (snapshot.assistantText?.length || 0)));
+    const text = publicAssistantText(delta).slice(0, Math.max(0, 100_000 - (snapshot.assistantText?.length || 0)));
-    if (!delta) return;
+    if (!text) return;
-    snapshot.assistantText = (snapshot.assistantText || "") + delta;
+    snapshot.assistantText = (snapshot.assistantText || "") + text;
     await ports.checkpoint(structuredClone(snapshot), "running");
-    ports.onAssistantText?.(delta);
+    ports.onAssistantText?.(text);
   }
   async function finishVerifiedCutout() {
     snapshot.nativeRuntime!.state = "stopped";
@@ -56,8 +79,8 @@ export async function runZcodeCanvasTask(ports: Ports): Promise<CanvasAgentRunSt
     return save(verifiedCompletion, "completed");
   }
   try {
-    if (snapshot.calls.some(call => call.status === "started" || call.uncertain))
+    const unconfirmed = snapshot.calls.find(call => call.status === "started" || call.uncertain);
-      return await save("存在结果未确认的工具调用，请先核对画布，避免重复生成。", "needs_review");
+    if (unconfirmed) return await save(failureMessage(unconfirmed), "needs_review");
     snapshot.nativeRuntime = { ...snapshot.nativeRuntime, engine: "zcode", state: "starting" };
     const schemas = new Map(Object.entries(ports.definitions).map(([name, definition]) => [name, asSchema(definition.inputSchema!)]));
     const toolDescriptors = Object.entries(ports.tools).map(([name, entry]) => ({ name,
@@ -72,6 +95,7 @@ export async function runZcodeCanvasTask(ports: Ports): Promise<CanvasAgentRunSt
       `可用业务工具：${tools.join("、")}。工具名称带 mcp__canvas__ 前缀。`,
       "原生文件、Bash、记忆及子任务能力仅作用于此任务的私有工作区，不能通过 shell 直接访问模型服务商或本站后台；业务操作使用 MCP。",
       "用户只要求生图或改图时，把结果写入画布并验收即可。除非用户明确要求下载或导出，不要主动调用 image_download，也不要为收尾打开交互面板。",
+      "用户设置的生成张数是本次任务的总数，包括验收未通过的已生成图片。达到张数后，保留结果并说明问题；如需再次生成，等待用户发送新指令。",
       "用户指定的生图模型被明确拒绝时，停止本轮收费操作，询问用户希望切换生图模型还是稍后重试。切换需用户确认并更新模型选择；结果未知的超时必须先核对原任务，不可直接换模型重发。不要为普通图片编辑调用 appearance.post 或其他无关业务接口。",
       "imagePreferences 是用户在输入框选择的生图模型和图片参数，与当前规划模型不同。生成和编辑图片优先用 generateCanvasImages；用户选定的模型不得被技能默认值、你选的其他模型或重试覆盖。自动选择生图模型时，图片工具内部会在明确失败后切换备用模型并补齐结果，不要自行重放付费操作；用户明确指定模型时禁止故障切换。比例、尺寸、数量、反向提示词等控件必须传入；不要通过其他生成接口绕过用户选择。分析、问答、排版等不需要出图的任务无需生成图片。",
       "转正面、换角度、旋转主体视角时，直接用 generateCanvasImages，referenceNodeIds 指向要编辑的真实图片，提示词描述目标视角并保留产品结构和未要求修改的细节。旧多视角功能、angleEditImage 和 image.multi_angle 已废弃，即使历史对话用过也不得再调用或打开旧面板。",
@@ -111,6 +135,7 @@ export async function runZcodeCanvasTask(ports: Ports): Promise<CanvasAgentRunSt
           await save("正在准备处理任务");
         }),
         onEvent: async (event: NativeEvent | NativeResult) => {
+          if (attemptController.signal.aborted) return;
           if (event.type === "model.streaming" && event.payload?.kind === "text_delta" && typeof event.payload.delta === "string") {
             // Child sessions and reasoning/tool-argument deltas are private.
             if (snapshot.nativeRuntime?.sessionId && event.sessionId !== snapshot.nativeRuntime.sessionId) return;
@@ -155,9 +180,11 @@ export async function runZcodeCanvasTask(ports: Ports): Promise<CanvasAgentRunSt
             if (!entry.readOnly && !snapshot.calls.some(call => call.name === "planCanvasTask" && call.status === "succeeded"))
               throw new Error("请先制定任务计划再执行画布修改");
             if (!entry.readOnly && snapshot.verification?.retryable && snapshot.verification.failedNodeIds?.length) {
-              const targets = [input.nodeId, ...(Array.isArray(input.nodeIds) ? input.nodeIds : []),
+              const targets = [input.nodeId, ...(Array.isArray(input.nodeIds) ? input.nodeIds : [])]
-                ...(Array.isArray(input.referenceNodeIds) ? input.referenceNodeIds : [])].filter((id): id is string => typeof id === "string");
+                .filter((id): id is string => typeof id === "string");
-              if (!targets.length || targets.some(id => !snapshot.verification!.failedNodeIds!.includes(id)))
+              const references = Array.isArray(input.referenceNodeIds) ? input.referenceNodeIds : [];
+              const failedIds = snapshot.verification.failedNodeIds;
+              if (targets.length ? targets.some(id => !failedIds.includes(id)) : !references.some(id => failedIds.includes(String(id))))
                 throw new Error("修复只能处理未通过验收的节点，禁止重复生成已通过的结果");
             }
             snapshot.calls.push({ id: callId, name, title: entry.title, input, status: "started" });
@@ -205,8 +232,9 @@ export async function runZcodeCanvasTask(ports: Ports): Promise<CanvasAgentRunSt
               call.status = "failed"; call.error = publicAgentError(error); call.rejected = error instanceof AgentToolRejectedError;
               call.confirmedNoResult = error instanceof AgentImageGenerationError && error.confirmedNoResult;
               call.uncertain = !entry.readOnly && !call.rejected && !call.confirmedNoResult;
-              if (call.confirmedNoResult) toolFailure = call.error;
+              if (call.uncertain || call.confirmedNoResult) toolFailure = failureMessage(call);
-              await save(call.error);
+              await save(toolFailure || call.error);
+              if (call.uncertain || call.confirmedNoResult) attemptController.abort();
             });
             throw error;
           }
@@ -228,15 +256,15 @@ export async function runZcodeCanvasTask(ports: Ports): Promise<CanvasAgentRunSt
       if (toolFailure) return await save(toolFailure, "needs_review");
       // A failed read is not an uncertain paid operation. Independently verify
       // actual outputs below instead of failing a task because an earlier read timed out.
-      if (snapshot.calls.some(call => (call.status === "failed" && !call.rejected && !call.confirmedNoResult && !ports.tools[call.name]?.readOnly) || call.uncertain))
+      const failedWrite = snapshot.calls.find(call => (call.status === "failed" && !call.rejected && !call.confirmedNoResult && !ports.tools[call.name]?.readOnly) || call.uncertain);
-        return await save("部分工具结果待确认，已保留执行记录，请核对后继续。", "needs_review");
+      if (failedWrite) return await save(failureMessage(failedWrite), "needs_review");
-      const unresolvedRead = snapshot.calls.some((call, index) => call.status === "failed" && !call.rejected && ports.tools[call.name]?.readOnly &&
+      const unresolvedRead = snapshot.calls.find((call, index) => call.status === "failed" && !call.rejected && ports.tools[call.name]?.readOnly &&
         !snapshot.calls.slice(index + 1).some(later => later.name === call.name && later.status === "succeeded" &&
           JSON.stringify(later.input) === JSON.stringify(call.input)));
       // Without a real result to independently inspect, a viewport/UI action
       // cannot turn a failed analysis into a completed task.
       if (unresolvedRead && !snapshot.resultNodeIds.length)
-        return await save("图片或资料暂未读取成功，已保留记录，请稍后继续核对。", "needs_review");
+        return await save(failureMessage(unresolvedRead), "needs_review");
       if (question || snapshot.calls.some(call => requiresCanvasInteraction(snapshot, call)))
         return await save(question || "请在已打开的工具面板中完成操作，然后继续任务。", "needs_review");
       const supplements = snapshot.inputs.filter(input => !startedInputs.has(input.id));
@@ -261,12 +289,12 @@ export async function runZcodeCanvasTask(ports: Ports): Promise<CanvasAgentRunSt
       const verification = await ports.verify(reviewSnapshot); snapshot.verification = verification;
       snapshot.inputTokens = reviewSnapshot.inputTokens; snapshot.outputTokens = reviewSnapshot.outputTokens;
       if (verification.passed) return await save(result.response || "任务完成，结果已写入画布。", "completed");
-      if (verification.retryable && snapshot.repairs < 2) {
+      if (verification.retryable && snapshot.repairs < 2 && !imageCountReached()) {
         snapshot.repairs++;
         prompt = `验收需要定点修复：${JSON.stringify(verification)}。只处理失败结果，禁止整批重新生成；保留所有通过结果。`;
         continue;
       }
-      return await save(`结果待核对：${verification.issues.join("；")}`, "needs_review");
+      return await save(reviewMessage(verification.issues), "needs_review");
     }
   } catch (error) {
     if (snapshot.nativeRuntime) snapshot.nativeRuntime.state = "stopped";
@@ -290,7 +318,7 @@ export async function runZcodeCanvasTask(ports: Ports): Promise<CanvasAgentRunSt
         if (control.cancelled || ports.signal.aborted) return await save("已停止后续步骤，完成的结果保留在画布。", "cancelled");
         if (inputs !== JSON.stringify(snapshot.inputs)) return await save("已收到新的补充要求，图片已保留，请继续处理。", "needs_review");
         return await save(verification.passed ? "图片已完成并通过检查，结果已保留在画布。"
-          : `图片已返回画布，结果待核对：${verification.issues.join("；")}`, verification.passed ? "completed" : "needs_review");
+          : `图片已返回画布，${reviewMessage(verification.issues)}`, verification.passed ? "completed" : "needs_review");
       } catch { /* Keep the original interruption if independent inspection also fails. */ }
     }
     return await save(cancelled ? "已停止后续步骤，完成的结果保留在画布。" : toolFailure || modelError || publicAgentError(error), cancelled ? "cancelled" : "needs_review");

lib/canvas/capabilities/headless-executor.ts

@@ -1,16 +1,16 @@
-import {
+import { executeBoxCutoutJob } from "@/lib/ai/box-cutout/service";
-  executeBoxCutoutJob,
-} from "@/lib/ai/box-cutout/service";
 import { executeExtendJob } from "@/lib/ai/extend/service";
 import { executeLayerSplitJob } from "@/lib/ai/layer-split/service";
 import { executeResizeJob } from "@/lib/ai/resize/service";
 import {
   executeRmbgJob,
   fetchImageBufferFromUrl,
+  RmbgServiceError,
 } from "@/lib/ai/rmbg/service";
 import type { CanvasCapabilityClientCommand } from "@/lib/canvas/capabilities/client-command";
 import type { CanvasCapabilityTarget } from "@/lib/canvas/capabilities/context";
 import { resolveCanvasRuntimeEndpoint } from "@/lib/canvas/capabilities/internal-endpoint";
+import { executeBoxCutoutPOST } from "@/lib/canvas/operations/box-cutout";
 import { generateCanvasImage } from "@/lib/canvas/generate-image";
 import { requestLongTaskResult } from "@/lib/client/long-task";
 import {
@@ -128,8 +128,10 @@ async function executeForTarget(
   if (command.capabilityId === "image.remove_background") {
     const imageBuffer = await fetchImageBufferFromUrl(target.sourceImageUrl);
     const result = await executeRmbgJob({
+      requestId: command.requestId,
       userId: params.userId,
       imageBuffer,
+      inputImageUrl: target.sourceImageUrl,
       sourceImageUrl: target.sourceImageUrl,
       prompt: prompt || "抠图处理",
       skipGallerySave: false,
@@ -185,8 +187,7 @@ async function executeForTarget(
   }
 
   if (command.capabilityId === "image.box_cutout") {
-    const result = await executeBoxCutoutJob({
+    const job = {
-      userId: params.userId,
       imageUrl: target.sourceImageUrl,
       sourceNodeId: target.nodeId,
       cropRect: {
@@ -197,13 +198,30 @@ async function executeForTarget(
       },
       paddingRatio: asFiniteNumber(command.args.paddingRatio),
       prompt: prompt || "框选抠图",
-    });
+    };
+    let result;
+    if (command.source === "toolbar") {
+      const response = await executeBoxCutoutPOST(new Request(params.requestUrl, {
+        method: "POST",
+        headers: { "Content-Type": "application/json", "X-Request-ID": command.requestId },
+        body: JSON.stringify(job),
+      }), params.userId);
+      result = await response.json();
+      if (!response.ok || !result.success) {
+        throw new RmbgServiceError(result.detail || result.message || result.error || "框选抠图未能完成", response.status);
+      }
+    } else {
+      result = await executeBoxCutoutJob({ ...job, requestId: command.requestId, userId: params.userId });
+    }
     return [{
       ...common,
       assetId: result.mediaAssetId || undefined,
       metadata: {
+        editMode: "box-cutout",
         cropRectApplied: result.cropRectApplied,
         paddedCropRectApplied: result.paddedCropRectApplied,
+        cropRectPixels: result.cropRectPixels,
+        paddedCropRectPixels: result.paddedCropRectPixels,
       },
       title: `${target.title}-框选抠图`,
       url: result.original_url,

lib/canvas/download-error.ts

@@ -0,0 +1,31 @@
+export type DownloadFailure = {
+  code: string;
+  message: string;
+  recommendation: string;
+  status: number;
+  retryable: boolean;
+};
+
+export function getDownloadFailure(error: unknown): DownloadFailure {
+  const text = error && typeof error === "object" && "message" in error
+    ? `${"name" in error ? error.name : "Error"}: ${error.message}` : String(error || "");
+  const failure = (code: string, message: string, recommendation: string, status: number, retryable = false) =>
+    ({ code, message, recommendation, status, retryable });
+  if (/旧存储已停用|storage_retired/.test(text)) return failure("STORAGE_RETIRED", "原图所在的旧存储已停用。", "请重新上传原图；重试下载无法恢复该文件。", 410);
+  if (/HTTP (?:404|410)|SOURCE_NOT_FOUND/i.test(text)) return failure("SOURCE_NOT_FOUND", "原图链接已失效或源文件已被删除。", "请重新上传原图，或联系管理员核对归档副本；无需重新生成图片。", 404);
+  if (/HTTP (?:401|403)|SOURCE_FORBIDDEN/i.test(text)) return failure("SOURCE_FORBIDDEN", "图片源站拒绝访问原图。", "请联系管理员检查原图访问权限或链接有效期，并提供下载编号。", 403);
+  if (/queue.*busy|正在准备的原图较多|DOWNLOAD_BUSY/i.test(text)) return failure("DOWNLOAD_BUSY", "正在准备的下载较多。", "请等待当前下载完成后再试，避免同时重复点击。", 429, true);
+  if (/TimeoutError|AbortError|timeout|timed out|deadline|超时|HTTP (?:408|504|524)/i.test(text)) return failure("SOURCE_TIMEOUT", "读取原图或准备下载文件超时。", "请稍后再次下载；持续失败时联系管理员并提供下载编号，已归档的原图无需重新生成。", 504, true);
+  if (/fetch failed|failed to fetch|ECONN|ENOTFOUND|EAI_AGAIN|network|HTTP (?:429|5\d\d)/i.test(text)) return failure("SOURCE_UNAVAILABLE", "暂时无法连接图片源站。", "请稍后重试下载；持续失败时联系管理员检查取图线路，并提供下载编号。", 503, true);
+  if (/not.*image|error document|不是图片|无法识别图片|empty response|image is empty|Invalid prepared original/i.test(text)) return failure("INVALID_IMAGE", "源地址没有返回可用的图片文件。", "请重新上传可打开的原图；若原图正常，请联系管理员并提供下载编号。", 422);
+  if (/sharp|pngload|jpegload|unsupported image|无法解析图片|convert|转换/i.test(text)) return failure("IMAGE_CONVERSION_FAILED", "原图无法转换为下载所需的 PNG 文件。", "请保留原图并联系管理员提供下载编号，或重新上传 PNG/JPEG 图片。", 422);
+  if (/upload|存储桶|保存下载|STORAGE_WRITE_FAILED/i.test(text)) return failure("DOWNLOAD_STORAGE_FAILED", "下载文件保存失败，已归档的原图仍然保留。", "请稍后重试；持续失败时联系管理员检查存储，并提供下载编号。", 503, true);
+  if (/未登录/.test(text)) return failure("LOGIN_REQUIRED", "登录状态已失效。", "请重新登录后下载，当前图片不会因此删除。", 401);
+  if (/无法确认原图/.test(text)) return failure("ORIGINAL_IMAGE_UNCONFIRMED", "图片链接包含处理参数，无法确认原图。", "请选择未裁剪、未缩放的原图链接，或重新上传原图。", 400);
+  if (/图片地址无效/.test(text)) return failure("INVALID_IMAGE_URL", "图片地址无效。", "请刷新画布后重新选择图片；仍然失败时请重新上传原图。", 400);
+  return failure("DOWNLOAD_FAILED", "下载准备未能完成。", "请联系管理员并提供下载编号，以便核对原图、转换和存储的具体错误；无需重新生成。", 500, true);
+}
+
+export function formatDownloadFailure(failure: DownloadFailure, requestId?: string) {
+  return `${failure.message}${failure.recommendation}${requestId ? `\n下载编号：${requestId}` : ""}`;
+}

lib/canvas/download-preparation.ts

@@ -1,6 +1,10 @@
 import "server-only";
-import { createHash } from "node:crypto";
+import { createHash, randomUUID } from "node:crypto";
 import { cacheImageBytes, readImageBytes, type ImageBytes } from "@/lib/storage/image-byte-cache";
+import { formatDownloadFailure, getDownloadFailure, type DownloadFailure } from "./download-error";
+import { createLogger } from "@/lib/observability/logger";
+
+const logger = createLogger("canvas.download");
 
 export type DownloadPreparationInput = {
   userId: string;
@@ -9,17 +13,18 @@ export type DownloadPreparationInput = {
   cookie: string;
 };
 type Result =
-  | { status: "preparing" }
+  | { status: "preparing"; requestId: string }
   | { status: "ready"; asset: ImageBytes }
-  | { status: "failed"; error: string };
+  | { status: "failed"; error: string; failure: DownloadFailure; requestId: string };
 type Job = {
+  requestId: string;
   userId: string;
   input: DownloadPreparationInput;
   status: "queued" | "running" | "ready" | "failed";
   updatedAt: number;
   asset?: ImageBytes;
+  failure?: DownloadFailure;
 };
-const FAILURE_MESSAGE = "原图暂时无法读取，图片仍保留在画布中，请稍后重试";
 const MAX_MEMORY_BYTES = 128 * 1024 * 1024;
 
 // A download is independent of node autosave and of the archive worker's batch.
@@ -69,7 +74,7 @@ export function createDownloadPreparationQueue(deps: {
               timer = setTimeout(() => {
                 controller.abort();
                 reject(new Error("Download preparation deadline"));
-              }, deps.timeoutMs || 90_000);
+              }, deps.timeoutMs || 150_000);
             }),
           ]);
           if (asset.contentType !== "image/png" || !asset.buffer.length || asset.buffer.length > MAX_MEMORY_BYTES) {
@@ -81,8 +86,10 @@ export function createDownloadPreparationQueue(deps: {
           const stored = await deps.read(key).catch(() => null);
           if (stored?.contentType === "image/png" && stored.buffer.length) job.asset = undefined;
           job.status = "ready";
-        } catch {
+        } catch (error) {
           job.status = "failed";
+          job.failure = getDownloadFailure(error);
+          logger.warn("preparation_failed", error, { requestId: job.requestId, code: job.failure.code });
         } finally {
           if (timer) clearTimeout(timer);
           // Do not retain authentication data after a preparation finishes.
@@ -105,8 +112,11 @@ export function createDownloadPreparationQueue(deps: {
       prune();
       const current = jobs.get(key);
       if (current?.status === "ready" && current.asset) return { status: "ready", asset: current.asset };
-      if (current?.status === "failed") return { status: "failed", error: FAILURE_MESSAGE };
+      if (current?.status === "failed") {
-      if (current && current.status !== "ready") return { status: "preparing" };
+        const failure = current.failure || getDownloadFailure(null);
+        return { status: "failed", error: formatDownloadFailure(failure, current.requestId), failure, requestId: current.requestId };
+      }
+      if (current && current.status !== "ready") return { status: "preparing", requestId: current.requestId };
       if (jobs.size >= 64) {
         for (const [oldKey, job] of jobs) {
           if (job.status === "ready" || job.status === "failed") jobs.delete(oldKey);
@@ -115,11 +125,14 @@ export function createDownloadPreparationQueue(deps: {
       }
       if (jobs.size >= 64 || [...jobs.values()].filter(job => job.userId === input.userId &&
           (job.status === "queued" || job.status === "running")).length >= 4) {
-        return { status: "failed", error: "正在准备的原图较多，请等待当前下载完成后再试" };
+        const requestId = randomUUID();
+        const failure = getDownloadFailure("DOWNLOAD_BUSY");
+        return { status: "failed", error: formatDownloadFailure(failure, requestId), failure, requestId };
       }
-      jobs.set(key, { userId: input.userId, input, status: "queued", updatedAt: now() });
+      const requestId = randomUUID();
+      jobs.set(key, { requestId, userId: input.userId, input, status: "queued", updatedAt: now() });
       deps.schedule(drain);
-      return { status: "preparing" };
+      return { status: "preparing", requestId };
     },
   };
 }

lib/canvas/generate-image.ts

@@ -5,7 +5,7 @@ import sharp from "sharp";
 import { agentImageCircuitStore } from "@/lib/ai/runtime/agent-model-circuit-store";
 import { getModelGenerationCreditCost, type DiscountableImageGenConfigLike } from "@/lib/ai/image-model-pricing";
 import { agentImageFailurePolicy } from "@/lib/ai/runtime/agent-image-failover";
-import { agentImageGenerationError } from "@/lib/ai/runtime/image-generation-error";
+import { agentImageGenerationError, ImageReferenceReadTimeoutError } from "@/lib/ai/runtime/image-generation-error";
 import { getAiModelById, getEnabledAiModelsWithProvider } from "@/lib/db/queries";
 import { fetchImageBufferFromUrl } from "@/lib/ai/rmbg/service";
 import { createGeminiImage } from "@/lib/ai/providers/gemini-image";
@@ -44,7 +44,8 @@ import {
 } from "@/lib/ai/runtime/model-health";
 import { uploadFile } from "@/lib/storage/service";
 import { isImageModelBalanceBlocked, resolveConfiguredImageBalanceFallback } from "@/lib/ai/runtime/image-balance";
-import { isProviderBalanceError } from "@/lib/request-error";
+import { getRequestFailureDetails, isProviderBalanceError } from "@/lib/request-error";
+import { normalizeLegacyAliyunStorageUrl } from "@/lib/storage/retired-storage";
 
 export interface CanvasLocalEditCompositeRegion {
   x: number;
@@ -180,6 +181,7 @@ export interface CanvasGenerateImageRequest {
   providerImageParams?: Record<string, unknown>;
   referenceImage?: string;
   referenceImages?: string[];
+  referenceImageBuffers?: ReadonlyMap<string, Buffer>;
   billingFeature?: "multi-view" | "repaint";
   requiredReferenceImageCount?: number;
   ownerKey?: string;
@@ -4632,10 +4634,10 @@ function findCanvasFailoverModel(params: {
 }
 
 export async function generateCanvasImage(
-  request: CanvasGenerateImageRequest
+  input: CanvasGenerateImageRequest
 ): Promise<CanvasGenerateImageResult> {
   const startedAt = Date.now();
-  if (request.agentImageMode === "pinned") request = { ...request, allowFailover: false };
+  const request = input.agentImageMode === "pinned" ? { ...input, allowFailover: false } : input;
   const prompt = String(request.prompt || "").trim();
   if (!prompt) {
     throw new Error("请输入提示词");
@@ -4873,11 +4875,16 @@ export async function generateCanvasImage(
     typeof request.ownerKey === "string" && request.ownerKey.trim()
       ? request.ownerKey.trim()
       : undefined;
-  const referenceImage =
+  const resolveReference = async (url: string) => {
-    typeof request.referenceImage === "string" ? request.referenceImage : undefined;
+    if (!normalizeLegacyAliyunStorageUrl(url)) return url;
-  const referenceImages = Array.isArray(request.referenceImages)
+    const { resolveLegacyAliyunStorageUrl } = await import("@/lib/storage/image-archive-db");
+    return resolveLegacyAliyunStorageUrl(url);
+  };
+  const referenceImage = typeof request.referenceImage === "string"
+    ? await resolveReference(request.referenceImage) : undefined;
+  const referenceImages = await Promise.all((Array.isArray(request.referenceImages)
     ? request.referenceImages
-    : [];
+    : []).map(resolveReference));
   const debugLabel = String(request.debugLabel || "").trim() || "canvas-image";
   const debugMeta =
     request.debugMeta && typeof request.debugMeta === "object"
@@ -5115,8 +5122,11 @@ export async function generateCanvasImage(
     });
   }
 
-  const { kept: reachableReferenceImages, dropped: unreachableReferenceImages } =
+  const referenceImageBuffers = provider.type === "alibaba-image" ? request.referenceImageBuffers : undefined;
-    await filterReachableRemoteUrls(normalizedReferenceImages, { timeoutMs: 3000 });
+  const referencesToCheck = normalizedReferenceImages.filter(url => !referenceImageBuffers?.has(url));
+  const { kept, dropped: unreachableReferenceImages } =
+    await filterReachableRemoteUrls(referencesToCheck, { timeoutMs: 3000 });
+  const reachableReferenceImages = normalizedReferenceImages.filter(url => referenceImageBuffers?.has(url) || kept.includes(url));
   const effectiveReferenceImages = selectCanvasReferenceImages({
     requested: normalizedReferenceImages, reachable: reachableReferenceImages,
     requiredCount: request.requiredReferenceImageCount,
@@ -5227,6 +5237,7 @@ export async function generateCanvasImage(
     executeGenerateBatch = async (batchImageCount) => {
       const result = await modelInstance.doGenerate({
         messages,
+        referenceImageBuffers,
         imageParams: {
           ...imageParams,
           imageCount: batchImageCount,
@@ -5656,8 +5667,17 @@ export async function generateCanvasImage(
     await slot.release();
   }
 
+  if (caughtError instanceof ImageReferenceReadTimeoutError) {
+    if (!collectedImages.length) throw caughtError;
+    return { images: collectedImages, model: selectedModel.model.displayName, modelRef: selectedModel.model.id, prompt: resultPrompt };
+  }
+
   // An accepted or uncertain request must not start another paid model/variant.
-  if (caughtError instanceof ProviderTaskUncertainError) throw caughtError;
+  if (caughtError && (
+    caughtError instanceof ProviderTaskUncertainError ||
+    getRequestFailureDetails(caughtError).outcome === "unknown" ||
+    ["AbortError", "TimeoutError"].includes(String((caughtError as { name?: string })?.name || ""))
+  )) throw caughtError;
 
   const retryVariants = Array.isArray(request.retryVariants)
     ? request.retryVariants

lib/canvas/image-generation-status.ts

@@ -0,0 +1,34 @@
+import type { RequestFailureDetails } from "@/lib/request-error";
+
+export type ImageGenerationStatusStreamPayload = {
+  phase?: "queued" | "processing" | "finalizing" | "failed" | "completed";
+  userMessageId?: string;
+  requestId?: string;
+  failure?: RequestFailureDetails;
+  providerType?: string;
+  modelName?: string;
+  imageCount?: number;
+  queuePosition?: number;
+  sameModelRunningCount?: number;
+  concurrencyLimit?: number;
+  estimatedWaitMs?: number;
+};
+
+export function findImageGenerationFailure(
+  messages: { role: string; parts?: unknown[] }[],
+  userMessageId: string,
+): ImageGenerationStatusStreamPayload | null {
+  if (!userMessageId) return null;
+  for (const message of [...messages].reverse()) {
+    if (message.role !== "assistant") continue;
+    for (const part of message.parts || []) {
+      const candidate = part as { type?: string; data?: ImageGenerationStatusStreamPayload };
+      if (candidate.type !== "data-imageGenerationStatus") continue;
+      const status = candidate.data;
+      if (status?.phase === "failed" && status.failure && status.userMessageId === userMessageId) {
+        return status;
+      }
+    }
+  }
+  return null;
+}

lib/canvas/image-preview-width.ts

@@ -0,0 +1,5 @@
+const PREVIEW_WIDTHS = [640, 960, 1280, 1600, 2048, 2600, 3200, 4096];
+
+export function canvasImagePreviewWidth(width: number, maxWidth: number) {
+  return Math.min(maxWidth, PREVIEW_WIDTHS.find(value => value >= width) || 4096);
+}

lib/canvas/operations/box-cutout.ts

@@ -0,0 +1,96 @@
+import "server-only";
+import { NextResponse } from "next/server";
+
+import {
+  BoxCutoutServiceError,
+  executeBoxCutoutJob,
+} from "@/lib/ai/box-cutout/service";
+import { RmbgServiceError } from "@/lib/ai/rmbg/service";
+import { getPointsSystemConfig } from "@/lib/db/queries";
+import { prepareFeaturePointsCharge } from "@/lib/points/feature-charge";
+import { getImageToolCreditCost } from "@/lib/points/config";
+import { formatRequestFailure, getRequestFailureDetails } from "@/lib/request-error";
+
+type BoxCutoutRequest = {
+  imageUrl?: string;
+  cropRect?: {
+    x?: number;
+    y?: number;
+    width?: number;
+    height?: number;
+  };
+  paddingRatio?: number;
+  prompt?: string;
+  chatId?: string | null;
+  messageId?: string | null;
+  skipGallerySave?: boolean;
+  sourceNodeId?: string;
+};
+
+export async function executeBoxCutoutPOST(request: Request, userId: string) {
+  const requestId = request.headers.get("x-request-id") || crypto.randomUUID();
+  try {
+    if (!userId) {
+      return NextResponse.json({ success: false, error: "未授权，请先登录" }, { status: 401 });
+    }
+
+    const body = (await request.json()) as BoxCutoutRequest;
+    const rawImageUrl = String(body.imageUrl || "").trim();
+    if (!rawImageUrl) {
+      throw new BoxCutoutServiceError("缺少原图链接，请重新选择图片后提交。", 400);
+    }
+
+    const resolvedImageUrl = new URL(rawImageUrl, request.url).toString();
+    const pointsConfig = await getPointsSystemConfig();
+    const pointsCharge = await prepareFeaturePointsCharge({
+      userId,
+      unitCost: getImageToolCreditCost(pointsConfig, "box-cutout"),
+      reason: "image_box_cutout",
+      modelId: "box-cutout",
+      note: "框选抠图消耗积分",
+      pointsConfig,
+    });
+    if (!pointsCharge.ok) {
+      return NextResponse.json(pointsCharge.payload, { status: pointsCharge.status });
+    }
+
+    const result = await executeBoxCutoutJob({
+      requestId,
+      userId,
+      imageUrl: resolvedImageUrl,
+      cropRect: body.cropRect || {},
+      paddingRatio: body.paddingRatio,
+      prompt: body.prompt || "框选抠图",
+      chatId: body.chatId || null,
+      messageId: body.messageId || null,
+      skipGallerySave: body.skipGallerySave === true,
+      sourceNodeId: body.sourceNodeId,
+    });
+
+    if (pointsCharge.chargeable) {
+      try {
+        await pointsCharge.consume();
+      } catch (pointsError) {
+        console.error("[Points] Failed to consume box cutout points:", pointsError);
+      }
+    }
+
+    return NextResponse.json({ ...result, requestId });
+  } catch (error) {
+    const failure = getRequestFailureDetails(error, "框选抠图未能完成");
+    const payload = {
+      success: false,
+      error: formatRequestFailure(failure, requestId),
+      detail: error instanceof Error ? error.message : "框选抠图未能完成",
+      code: failure.code,
+      failure,
+      requestId,
+    };
+    if (error instanceof BoxCutoutServiceError || error instanceof RmbgServiceError) {
+      return NextResponse.json(payload, { status: error.status });
+    }
+
+    console.error("[BoxCutout] 处理失败:", error);
+    return NextResponse.json(payload, { status: 500 });
+  }
+}

lib/canvas/operations/rmbg.ts

@@ -9,9 +9,11 @@ import {
 import { getPointsSystemConfig } from "@/lib/db/queries";
 import { prepareFeaturePointsCharge } from "@/lib/points/feature-charge";
 import { getImageToolCreditCost } from "@/lib/points/config";
+import { formatRequestFailure, getRequestFailureDetails } from "@/lib/request-error";
 
 
 export async function executeRemoveBackgroundPOST(request: Request, trustedUserId: string) {
+  const requestId = request.headers.get("x-request-id") || crypto.randomUUID();
   try {
     const session = { user: { id: trustedUserId } };
     if (!session?.user?.id) {
@@ -27,6 +29,7 @@ export async function executeRemoveBackgroundPOST(request: Request, trustedUserI
     let messageId: string | null = null;
     let skipGallerySave = false;
     let sourceImageUrl: string | null = null;
+    let inputImageUrl: string | null = null;
 
     if (contentType.includes("application/json")) {
       const body = await request.json();
@@ -40,6 +43,7 @@ export async function executeRemoveBackgroundPOST(request: Request, trustedUserI
 
       if (imageUrl) {
         sourceImageUrl = String(imageUrl);
+        inputImageUrl = sourceImageUrl;
         imageBuffer = await fetchImageBufferFromUrl(sourceImageUrl);
       } else if (body.image_base64) {
         imageBase64 = String(body.image_base64);
@@ -94,6 +98,7 @@ export async function executeRemoveBackgroundPOST(request: Request, trustedUserI
     }
 
     const result = await executeRmbgJob({
+      requestId,
       userId: session.user.id,
       imageBuffer,
       imageBase64,
@@ -101,6 +106,7 @@ export async function executeRemoveBackgroundPOST(request: Request, trustedUserI
       chatId,
       messageId,
       skipGallerySave,
+      inputImageUrl,
       sourceImageUrl,
     });
 
@@ -114,22 +120,29 @@ export async function executeRemoveBackgroundPOST(request: Request, trustedUserI
 
     return NextResponse.json({
       success: true,
+      requestId,
       ...result,
     });
   } catch (error) {
     if (error instanceof RmbgServiceError) {
+      const failure = getRequestFailureDetails(error);
       return NextResponse.json(
         {
-          error: error.message,
+          success: false,
+          error: formatRequestFailure(failure, requestId),
           detail: error.detail || error.message,
+          code: failure.code,
+          failure,
+          requestId,
         },
         { status: error.status }
       );
     }
 
     console.error("[RMBG API] 处理错误:", error);
+    const failure = getRequestFailureDetails(error, "抠图请求未能完成");
     return NextResponse.json(
-      { error: "服务器内部错误", detail: error instanceof Error ? error.message : "未知错误" },
+      { success: false, error: formatRequestFailure(failure, requestId), detail: error instanceof Error ? error.message : "未知错误", code: failure.code, failure, requestId },
       { status: 500 }
     );
   }

lib/canvas/photoshop-safe-download.ts

@@ -2,6 +2,7 @@ import { createHash } from "node:crypto";
 import { isRetiredStorageUrl, RETIRED_STORAGE_MESSAGE } from "@/lib/storage/retired-storage";
 import { fetchImageBytes, onceImageBytes } from "@/lib/storage/image-byte-cache";
 import { extractImageProxySourceUrl, inferOriginalImageUrl } from "@/lib/image-url";
+import { getDownloadFailure } from "./download-error";
 
 type DownloadFileItem = {
   url: string;
@@ -31,6 +32,7 @@ function sleep(ms: number) {
 
 function normalizeDownloadError(error: unknown): string {
   if (error instanceof Error) return error.message || "download failed";
+  if (error && typeof error === "object" && "message" in error && typeof error.message === "string") return error.message;
   if (typeof error === "string") return error;
   return "download failed";
 }
@@ -215,7 +217,9 @@ export async function convertImageToPhotoshopPng(bytes: Buffer): Promise<Buffer>
     throw new Error("无法解析图片尺寸");
   }
   // RGB/RGBA, 8-bit, single-frame PNG is already compatible; preserve its exact bytes.
-  if (metadata.format === "png" && metadata.space === "srgb" && metadata.depth === "uchar"
+  const rgb = (metadata.space === "srgb" && metadata.depth === "uchar")
+    || (metadata.space === "rgb16" && metadata.depth === "ushort");
+  if (metadata.format === "png" && rgb
       && !metadata.isPalette && (metadata.pages || 1) === 1 && (!metadata.orientation || metadata.orientation === 1)) return bytes;
   return image.rotate().toColorspace("srgb").png({ compressionLevel: 3, adaptiveFiltering: true }).toBuffer();
 }
@@ -330,6 +334,7 @@ export async function fetchCanvasDownloadAsset(params: {
       try {
         const data = await fetchImageBytes(candidateUrl, {
           timeoutMs,
+          signal: params.signal,
           headers: buildRemoteFetchHeaders(candidateUrl, params.requestOrigin, params.cookie),
           // Authenticated local assets must never share a cache across users.
           scope: new URL(candidateUrl).origin === params.requestOrigin && params.cookie
@@ -344,11 +349,13 @@ export async function fetchCanvasDownloadAsset(params: {
         });
       } catch (error) {
         params.signal?.throwIfAborted();
-        lastError = normalizeDownloadError(error);
+        const message = normalizeDownloadError(error);
+        if (!lastError || getDownloadFailure(message).retryable || !getDownloadFailure(lastError).retryable) lastError = message;
       }
     }
     // Archiving may have completed during the failed fetch. Resolve aliases
     // again before retrying, rather than spending every attempt on the old URL.
+    if (!getDownloadFailure(lastError).retryable) break;
     if (attempt < retryCount) await sleep(350 * attempt);
   }
 

lib/canvas/scale-adjust-product-lock.ts

@@ -40,22 +40,6 @@ function clamp(value: number, min: number, max: number) {
   return Math.min(max, Math.max(min, value));
 }
 
-async function executeScaleAdjustRmbgJob(
-  params: Parameters<typeof executeRmbgJob>[0]
-) {
-  let lastError: unknown;
-  for (let attempt = 1; attempt <= 3; attempt += 1) {
-    try {
-      return await executeRmbgJob(params);
-    } catch (error) {
-      lastError = error;
-      if (attempt === 3) break;
-      await new Promise((resolve) => setTimeout(resolve, attempt * 800));
-    }
-  }
-  throw lastError;
-}
-
 function rectToPixelBox(
   rect: CanvasScaleAdjustRect,
   sourceWidth: number,
@@ -220,7 +204,7 @@ async function buildPersonExclusionAlpha(params: {
   userId: string;
 }) {
   try {
-    const person = await executeScaleAdjustRmbgJob({
+    const person = await executeRmbgJob({
       foregroundType: "person",
       imageBuffer: params.sourceBuffer,
       prompt: "比例调整人物保护蒙版",
@@ -330,7 +314,7 @@ export async function buildScaleAdjustProductLockAssets(params: {
       .png({ compressionLevel: 6 })
       .toBuffer();
     semanticSourceCropBuffers.push(cropBuffer);
-    const subject = await executeScaleAdjustRmbgJob({
+    const subject = await executeRmbgJob({
       imageBuffer: cropBuffer,
       prompt: "比例调整完整产品蒙版",
       skipGallerySave: true,

lib/client/canvas-draft.ts

@@ -0,0 +1,55 @@
+export type CanvasDraft = { base: string; snapshot: string };
+const key = (projectId: string) => `canvas-unsynced:${projectId}`;
+
+export function readCanvasDraft(projectId: string): CanvasDraft | null {
+  try {
+    const value = JSON.parse(localStorage.getItem(key(projectId)) || "null");
+    return typeof value?.base === "string" && typeof value?.snapshot === "string" ? value : null;
+  } catch {
+    return null;
+  }
+}
+
+export function writeCanvasDraft(projectId: string, draft: CanvasDraft): boolean {
+  try {
+    localStorage.setItem(key(projectId), JSON.stringify(draft));
+    return true;
+  } catch {
+    return false;
+  }
+}
+
+export function clearCanvasDraft(projectId: string) {
+  try {
+    localStorage.removeItem(key(projectId));
+  } catch {
+    // Keep the current in-memory canvas when browser storage is unavailable.
+  }
+}
+
+const composerKey = (chatId: string) => `canvas-unsent-message:${chatId}`;
+export function writeCanvasComposerDraft(chatId: string, draft: { text: string; attachments: unknown[] }) {
+  try {
+    localStorage.setItem(composerKey(chatId), JSON.stringify(draft));
+    return true;
+  } catch {
+    return false;
+  }
+}
+
+export function readCanvasComposerDraft<T>(chatId: string): { text: string; attachments: T[] } | null {
+  try {
+    const value = JSON.parse(localStorage.getItem(composerKey(chatId)) || "null");
+    return typeof value?.text === "string" && Array.isArray(value?.attachments) ? value : null;
+  } catch {
+    return null;
+  }
+}
+
+export function clearCanvasComposerDraft(chatId: string) {
+  try {
+    localStorage.removeItem(composerKey(chatId));
+  } catch {
+    // Keep the current editor contents when browser storage is unavailable.
+  }
+}

lib/client/canvas-image-download.ts

@@ -1,5 +1,6 @@
-import { buildImageProxyUrl } from "@/lib/image-delivery";
+import { buildImageProxyUrl, getImageDownloadExtension } from "@/lib/image-delivery";
 import { inferOriginalImageUrl } from "@/lib/image-url";
+import { formatDownloadFailure, getDownloadFailure, type DownloadFailure } from "@/lib/canvas/download-error";
 
 export type CanvasImageDownloadPhase = "preparing" | "downloading" | "saving";
 
@@ -26,6 +27,8 @@ export class CanvasImageDownloadError extends Error {
   code: CanvasImageDownloadErrorCode;
   retryAfterSeconds?: number;
   status?: number;
+  failure?: DownloadFailure;
+  requestId?: string;
 
   constructor(
     message: string,
@@ -33,6 +36,8 @@ export class CanvasImageDownloadError extends Error {
       code: CanvasImageDownloadErrorCode;
       retryAfterSeconds?: number;
       status?: number;
+      failure?: DownloadFailure;
+      requestId?: string;
     }
   ) {
     super(message);
@@ -40,11 +45,14 @@ export class CanvasImageDownloadError extends Error {
     this.code = options.code;
     this.retryAfterSeconds = options.retryAfterSeconds;
     this.status = options.status;
+    this.failure = options.failure;
+    this.requestId = options.requestId;
   }
 }
 
 export function getCanvasImageDownloadErrorMessage(error: unknown) {
   if (error instanceof CanvasImageDownloadError) {
+    if (error.failure) return formatDownloadFailure(error.failure, error.requestId);
     if (error.code === "rate_limited") {
       return error.retryAfterSeconds
         ? `图片下载请求过于频繁，请 ${error.retryAfterSeconds} 秒后重试`
@@ -54,10 +62,10 @@ export function getCanvasImageDownloadErrorMessage(error: unknown) {
       return "原图暂时无法读取，图片仍保留在画布中，请稍后重试";
     }
     if (error.code === "preparation_timeout") {
-      return "原图仍在后台准备中，请稍后再次点击下载";
+      return `原图仍在后台准备中，请稍后再次点击下载${error.requestId ? `\n下载编号：${error.requestId}` : ""}`;
     }
   }
-  return error instanceof Error ? error.message : "图片下载失败，请稍后重试";
+  return formatDownloadFailure(getDownloadFailure(error));
 }
 
 type DownloadCanvasImageParams = {
@@ -71,6 +79,8 @@ type DownloadCanvasImageParams = {
 type DownloadErrorPayload = {
   error?: string;
   retryAfter?: number;
+  failure?: DownloadFailure;
+  requestId?: string;
 };
 
 const MAX_RATE_LIMIT_RETRIES = 1;
@@ -166,6 +176,63 @@ function triggerBlobDownload(blob: Blob, filename: string) {
   window.setTimeout(() => URL.revokeObjectURL(blobUrl), 1000);
 }
 
+function triggerCdnDownload(result: { downloadUrl: string; filename: string; bytes?: number }, signal?: AbortSignal) {
+  if (typeof result.downloadUrl !== "string" || new URL(result.downloadUrl).protocol !== "https:") {
+    throw new Error("下载链接无效");
+  }
+  signal?.throwIfAborted();
+  const frame = document.createElement("iframe");
+  frame.hidden = true;
+  frame.src = result.downloadUrl;
+  document.body.appendChild(frame);
+  window.setTimeout(() => frame.remove(), 10 * 60_000);
+  return { filename: result.filename, bytes: result.bytes || 0 };
+}
+
+/** Keep the source format and bytes for chat, gallery and reference downloads. */
+export async function downloadOriginalImage({ url, name, signal, onProgress }: DownloadCanvasImageParams): Promise<CanvasImageDownloadResult> {
+  const source = String(url || "").trim();
+  if (!source) throw new Error("图片地址无效");
+  const proxy = buildImageProxyUrl(source, { delivery: "original" });
+  const filenameBase = sanitizeDownloadName(name || inferDownloadNameFromUrl(source), "image");
+  const target = new URL(proxy, window.location.origin);
+  onProgress?.({ phase: "preparing", message: "正在准备原图..." });
+  const checkedFetch = async (input: string) => {
+    let response: Response;
+    try { response = await fetch(input, { signal }); }
+    catch (error) {
+      if (signal?.aborted) throw error;
+      const failure = getDownloadFailure(error);
+      throw new CanvasImageDownloadError(failure.message, { code: "request_failed", failure });
+    }
+    if (!response.ok) {
+      const payload = await response.json().catch(() => null) as DownloadErrorPayload | null;
+      throw new CanvasImageDownloadError(payload?.error || "原图下载失败", { code: "request_failed",
+        status: response.status, failure: payload?.failure || getDownloadFailure(`HTTP ${response.status}`), requestId: payload?.requestId });
+    }
+    return response;
+  };
+  if (target.origin === window.location.origin && target.pathname === "/api/image-proxy") {
+    target.searchParams.set("download", "resolve");
+    target.searchParams.set("name", filenameBase);
+    const metadata = await checkedFetch(target.pathname + target.search);
+    const delivery = await metadata.json();
+    if (delivery.delivery === "cdn") {
+      const result = triggerCdnDownload(delivery, signal);
+      onProgress?.({ phase: "downloading", message: "已开始下载，可在浏览器下载列表查看进度" });
+      return result;
+    }
+    if (delivery.delivery !== "proxy") throw new Error("下载链接无效");
+  }
+  const response = await checkedFetch(proxy);
+  const blob = await readResponseBlobWithProgress(response, onProgress);
+  if (!blob.type.toLowerCase().startsWith("image/")) throw new Error("Source is not an image");
+  const extension = getImageDownloadExtension(blob.type);
+  const filename = extension ? `${filenameBase}.${extension}` : filenameBase;
+  triggerBlobDownload(blob, filename);
+  return { filename, bytes: blob.size };
+}
+
 function toDownloadCandidates(url: string, candidates: string[] = []) {
   const raw = String(url || "").trim();
   const originalUrl = String(inferOriginalImageUrl(raw) || raw).trim();
@@ -257,6 +324,7 @@ export async function downloadCanvasImageAsPng({
   let preparationPolls = 0;
   for (;;) {
     signal?.throwIfAborted();
+    try {
       response = await fetch("/api/canvas/download-image", {
       method: "POST",
       headers: { "Content-Type": "application/json" },
@@ -269,6 +337,11 @@ export async function downloadCanvasImageAsPng({
       }),
       signal,
       });
+    } catch (error) {
+      if (signal?.aborted) throw error;
+      const failure = getDownloadFailure(error);
+      throw new CanvasImageDownloadError(failure.message, { code: "request_failed", failure });
+    }
 
     if (response.status === 202) {
       rateLimitRetries = 0;
@@ -278,7 +351,7 @@ export async function downloadCanvasImageAsPng({
         throw new CanvasImageDownloadError("下载准备状态无效", { code: "request_failed", status: 202 });
       }
       if (Date.now() >= preparationDeadline || preparationPolls >= 60) {
-        throw new CanvasImageDownloadError("原图仍在准备中", { code: "preparation_timeout", status: 202 });
+        throw new CanvasImageDownloadError("原图仍在准备中", { code: "preparation_timeout", status: 202, requestId: preparing.requestId });
       }
       onProgress?.({ phase: "preparing", message: preparing.message || "正在准备原图，完成后将自动下载" });
       const delaySeconds = Math.max(preparationPolls > 5 ? 5 : 1, Math.min(5, Number(preparing.retryAfter) || 3));
@@ -299,6 +372,8 @@ export async function downloadCanvasImageAsPng({
           code: "rate_limited",
           retryAfterSeconds,
           status: response.status,
+          failure: errorPayload?.failure,
+          requestId: errorPayload?.requestId,
         }
       );
     }
@@ -321,22 +396,18 @@ export async function downloadCanvasImageAsPng({
       {
         code: status === 502 ? "source_unavailable" : "request_failed",
         status,
+        failure: errorPayload?.failure,
+        requestId: errorPayload?.requestId,
       }
     );
   }
 
   if (response.headers.get("content-type")?.includes("application/json")) {
     const result = await response.json();
-    if (result.delivery !== "cdn" || typeof result.downloadUrl !== "string"
+    if (result.delivery !== "cdn") throw new Error("下载链接无效");
-        || new URL(result.downloadUrl).protocol !== "https:") throw new Error("下载链接无效");
+    const downloaded = triggerCdnDownload(result, signal);
-    if (signal?.aborted) throw signal.reason || new DOMException("已取消下载", "AbortError");
-    const frame = document.createElement("iframe");
-    frame.hidden = true;
-    frame.src = result.downloadUrl;
-    document.body.appendChild(frame);
-    window.setTimeout(() => frame.remove(), 10 * 60_000);
     onProgress?.({ phase: "downloading", message: "已开始下载，可在浏览器下载列表查看进度" });
-    return { filename: result.filename, bytes: result.bytes || 0 };
+    return downloaded;
   }
 
   const filename =

lib/client/canvas-site-settings.ts

@@ -1,11 +1,27 @@
+import type { AgentWorkflowComposerContext } from "@/types/agent";
+
 const settingsCache = new Map<string, { etag: string; data: unknown }>();
 
+export async function fetchWorkflowTemplatePrompts([url, selectionRequest]: readonly [string, string]) {
+  const response = await fetch(url, {
+    method: "POST",
+    headers: { "Content-Type": "application/json" },
+    body: selectionRequest,
+    signal: AbortSignal.timeout(15_000),
+  });
+  if (!response.ok) throw new Error("风格模板提示词加载失败");
+  const data = await response.json() as { selections?: AgentWorkflowComposerContext["selections"] };
+  if (!Array.isArray(data.selections)) throw new Error("风格模板提示词返回异常");
+  return { selectionRequest, selections: data.selections };
+}
+
 export async function fetchCanvasSiteSettings(url: string) {
   const cached = settingsCache.get(url);
   const controller = new AbortController();
   const timeoutId = setTimeout(
     () => controller.abort(),
-    url === "/api/site-settings?scope=agent-canvas" ? 30_000 : 10_000
+    url === "/api/site-settings?scope=agent-canvas" ||
+      url === "/api/site-settings?scope=agent-workflow-templates" ? 30_000 : 10_000
   );
   try {
     const response = await fetch(url, {

lib/client/canvas-toolbar-capability.ts

@@ -63,4 +63,5 @@ export async function executeCanvasToolbarCapability(
   }
   current.loadCanvas(JSON.parse(merged.snapshot).canvasData);
   current.setCanvasRevision(String(result.data.updatedAt), String(result.data.updatedAt));
+  return { projectId, canvasData: result.data.canvasData, updatedAt: String(result.data.updatedAt) };
 }

lib/client/page-refresh.ts

@@ -0,0 +1,15 @@
+export const BEFORE_PAGE_REFRESH = "app:before-page-refresh";
+export type PageRefreshRequest = {
+  save: (action: () => Promise<void>) => void;
+  block: (message: string) => void;
+};
+
+export async function preparePageRefresh() {
+  const actions: Array<() => Promise<void>> = [];
+  let blocked = "";
+  window.dispatchEvent(new CustomEvent<PageRefreshRequest>(BEFORE_PAGE_REFRESH, {
+    detail: { save: action => actions.push(action), block: message => { blocked ||= message; } },
+  }));
+  if (blocked) throw new Error(blocked);
+  for (const action of actions) await action();
+}

lib/image-delivery.ts

@@ -1,5 +1,17 @@
+import { normalizeLegacyAliyunStorageUrl } from "./storage/retired-storage";
+
 const IMAGE_PROXY_PATH = "/api/image-proxy";
 
+/** Error fallbacks must keep unavailable legacy sources behind archive resolution. */
+export function buildImageFallbackUrl(value: string | null | undefined): string {
+  const source = value || "";
+  const legacy = normalizeLegacyAliyunStorageUrl(source);
+  const modelImage = isAlibabaModelImageUrl(source);
+  if (!legacy && !modelImage) return source;
+  const proxy = buildImageProxyUrl(legacy || source, modelImage ? { width: 960, quality: 86, format: "webp" } : {});
+  return typeof window === "undefined" ? proxy : new URL(proxy, window.location.origin).toString();
+}
+
 type ImageProxyFormat = "webp" | "avif" | "jpeg" | "png";
 
 export type ImageProxyOptions = {
@@ -9,6 +21,26 @@ export type ImageProxyOptions = {
   delivery?: "display" | "proxy" | "original";
 };
 
+export function getFullscreenPreviewSize({
+  imageWidth,
+  imageHeight,
+  viewportWidth,
+  viewportHeight,
+  pixelRatio = 1,
+}: {
+  imageWidth: number;
+  imageHeight: number;
+  viewportWidth: number;
+  viewportHeight: number;
+  pixelRatio?: number;
+}) {
+  const ratio = imageWidth > 0 && imageHeight > 0 ? imageWidth / imageHeight : 1;
+  const displayWidth = Math.min(viewportWidth * 0.95, viewportHeight * 0.95 * ratio);
+  const requiredWidth = displayWidth * Math.max(1, pixelRatio || 1);
+  const requestWidth = [640, 960, 1280, 1600, 2048, 2560, 3200, 4096].find((width) => width >= requiredWidth) || 4096;
+  return { displayWidth, requestWidth };
+}
+
 /** Preserve the actual response format when naming an original download. */
 export function getImageDownloadExtension(contentType: string) {
   const mime = contentType.split(";")[0]?.trim().toLowerCase();
@@ -20,6 +52,8 @@ export function getImageDownloadExtension(contentType: string) {
     "image/avif": "avif",
     "image/gif": "gif",
     "image/svg+xml": "svg",
+    "image/bmp": "bmp",
+    "image/tiff": "tiff",
   };
   return extensions[mime] || "";
 }
@@ -57,6 +91,15 @@ function isAliyunOssImageHost(hostname: string): boolean {
   return normalized.endsWith(".aliyuncs.com") && normalized.includes(".oss-");
 }
 
+/** Model result buckets allow downloading objects but deny OSS image processing. */
+export function isAlibabaModelImageUrl(value: string): boolean {
+  try {
+    return /^dashscope(?:-[a-z0-9-]+)?\.oss-[a-z0-9-]+\.aliyuncs\.com$/i.test(new URL(value).hostname);
+  } catch {
+    return false;
+  }
+}
+
 function isTrustedDirectStorageImageHost(hostname: string): boolean {
   const normalized = hostname.trim().toLowerCase();
   let configuredCdnHost = "";
@@ -183,8 +226,8 @@ export function buildImageProxyUrl(url: string, options: ImageProxyOptions = {})
     return source;
   }
 
-  // An original download must go through the same-origin byte-preserving
+  // The same-origin endpoint can resolve a native CDN download without relying
-  // proxy even for trusted storage hosts: a direct fetch may fail CORS.
+  // on cross-origin fetch, while retaining a byte-preserving proxy fallback.
   if (options.delivery === "original") {
     const params = new URLSearchParams({ url: source, original: "1" });
     return `${IMAGE_PROXY_PATH}?${params.toString()}`;
@@ -198,7 +241,7 @@ export function buildImageProxyUrl(url: string, options: ImageProxyOptions = {})
     return trustedDirectStorageUrl;
   }
 
-  if (options.delivery !== "proxy") {
+  if (options.delivery !== "proxy" && !normalizeLegacyAliyunStorageUrl(source) && !isAlibabaModelImageUrl(source)) {
     const directDisplayUrl = resolveAliyunOssDisplayUrl(source, options);
     if (directDisplayUrl) {
       return directDisplayUrl;

lib/jobs/image-archive-job.ts

@@ -1,4 +1,4 @@
-import { preparePendingImageDownloads } from "@/lib/storage/image-download-preparation";
+import { scheduleImageDownloadPreparation } from "@/lib/storage/image-download-preparation";
 import "server-only";
 import { trackRuntimeWork } from "@/lib/observability/active-work";
 
@@ -32,6 +32,7 @@ export async function runImageArchiveJob() {
   console.log(`[ImageArchiveJob] Start image archive job (batchSize=${batchSize})`);
 
   await recoverStaleImageArchiveTasks();
+  scheduleImageDownloadPreparation();
   const storeTasks = await getImageArchiveTasksToStore({ limit: batchSize });
   let storeSucceeded = 0;
   let storeFailed = 0;
@@ -40,11 +41,13 @@ export async function runImageArchiveJob() {
     try {
       if (!(await markImageArchiveTaskArchiving(task.id))) return;
       const metadata = task.metadata as { inlineSource?: string } | null;
-      const archived = await archiveTemporaryImage(metadata?.inlineSource || task.sourceUrl);
+      const archived = await archiveTemporaryImage(metadata?.inlineSource || task.sourceUrl, task.id);
       await markImageArchiveTaskStored({
         id: task.id,
         targetUrl: archived.url,
+        downloadAsset: archived.downloadAsset,
       });
+      if (!archived.downloadAsset) scheduleImageDownloadPreparation(task.id);
       storeSucceeded += 1;
       console.log("[ImageArchiveJob] stored", {
         taskId: task.id,
@@ -108,7 +111,6 @@ export async function runImageArchiveJob() {
     }
   }
 
-  const downloadTasks = await preparePendingImageDownloads();
   const stats = await getImageArchiveTaskStats();
   return {
     success: true,
@@ -124,8 +126,8 @@ export async function runImageArchiveJob() {
       failed: replaceFailed,
     },
     stats,
-    downloadTasks,
+    downloadTasks: 0,
     pendingDownloads: await hasPendingImageDownloads(),
   };
-  });
+  }, { durable: true });
 }

lib/observability/active-work.ts

@@ -3,13 +3,14 @@ import { unlinkSync, writeFileSync } from "node:fs";
 import { tmpdir } from "node:os";
 import { join } from "node:path";
 
-const state = globalThis as typeof globalThis & { __aiChatbotActiveWork?: number };
+const state = globalThis as typeof globalThis & { __aiChatbotActiveWork?: number; __aiChatbotDurableWork?: number };
 const path = join(process.platform === "win32" ? tmpdir() : "/tmp", `ai-chatbot-active-work-${process.pid}.json`);
 
-function update(delta: number) {
+function update(delta: number, durable: boolean) {
   state.__aiChatbotActiveWork = (state.__aiChatbotActiveWork || 0) + delta;
+  if (durable) state.__aiChatbotDurableWork = (state.__aiChatbotDurableWork || 0) + delta;
   try {
-    writeFileSync(path, JSON.stringify({ pid: process.pid, active: state.__aiChatbotActiveWork }), { mode: 0o600 });
+    writeFileSync(path, JSON.stringify({ pid: process.pid, active: state.__aiChatbotActiveWork, durable: state.__aiChatbotDurableWork || 0 }), { mode: 0o600 });
   } catch (error) {
     try { unlinkSync(path); } catch {}
     console.warn("[Active Work] Failed to record running work:", error);
@@ -17,7 +18,7 @@ function update(delta: number) {
 }
 
 /** Includes generation that continues after the client connection closes. */
-export async function trackRuntimeWork<T>(execute: () => T | Promise<T>): Promise<T> {
+export async function trackRuntimeWork<T>(execute: () => T | Promise<T>, options: { durable?: boolean } = {}): Promise<T> {
-  update(1);
+  update(1, options.durable === true);
-  try { return await execute(); } finally { update(-1); }
+  try { return await execute(); } finally { update(-1, options.durable === true); }
 }

lib/request-error.ts

@@ -228,9 +228,78 @@ export function getRequestFailureDetails(
   const status = getRequestErrorStatus(error);
   const detail = (code: string, message: string, recommendation: string, outcome: "failed" | "unknown" = "failed") =>
     ({ code, message, recommendation, outcome });
+  if (/抠图参考图文件大小超限/.test(text)) {
+    return detail("RMBG_INPUT_TOO_LARGE", getRequestErrorMessage(error) || "抠图参考图超过 AOS 的 50 MB 上限。", "请手动压缩至 50 MB 以内后重新提交。本次未提交上游抠图任务。");
+  }
+  if (/抠图参考图分辨率超限/.test(text)) {
+    return detail("RMBG_INPUT_RESOLUTION_EXCEEDED", getRequestErrorMessage(error) || "抠图参考图超过 AOS 的 4096 像素上限。", "请手动将宽、高均调整至 4096 像素以内，再重新提交。本次未提交上游抠图任务。");
+  }
+  if (/抠图参考图格式不支持/.test(text)) {
+    return detail("RMBG_INPUT_FORMAT_UNSUPPORTED", getRequestErrorMessage(error) || "AOS 不支持此参考图格式。", "请导出为 JPG、PNG 或 WebP 后重新提交。本次未提交上游抠图任务。");
+  }
+  const aosResolution = text.match(/(?:resolution excess,\s*width=(\d+),\s*height=(\d+)|图片分辨率超限（(\d+)x(\d+)）)/i);
+  if (aosResolution) {
+    return detail("RMBG_PROVIDER_RESOLUTION_EXCEEDED", `AOS 拒绝了参考图：分辨率为 ${aosResolution[1] || aosResolution[3]}×${aosResolution[2] || aosResolution[4]} 像素，宽、高均须不超过 4096 像素。`, "请手动调整尺寸后重新提交。");
+  }
+  if (/AOS.*invalid file|图片文件无法识别/i.test(text)) {
+    return detail("RMBG_PROVIDER_INVALID_FILE", "AOS 无法识别参考图，文件可能损坏或格式不受支持。", "请确认原图可以正常打开，并导出为 JPG、PNG 或 WebP 后重新提交。");
+  }
+  const aosState = text.match(/AOS任务失败（状态 (-\d+)，/);
+  if (aosState) {
+    const state = Number(aosState[1]);
+    if (state === -5) return detail("RMBG_PROVIDER_URL_TOO_LARGE", "AOS 拒绝读取参考图：链接取图大小超过上游的 30 MB 上限。", "请联系管理员核对文件提交方式；不要连续点击。上游文件上传接口允许最大 50 MB。");
+    if (state === -7) return detail("RMBG_PROVIDER_INVALID_FILE", "AOS 无法识别参考图，文件可能损坏或格式不受支持。", "请确认原图可以正常打开，并导出为 JPG、PNG 或 WebP 后重新提交。");
+    if (state === -3) return detail("RMBG_PROVIDER_SOURCE_DOWNLOAD_FAILED", "AOS 下载参考图失败，未能读取原图。", "请确认原图链接可打开；若原图正常，请联系管理员检查上游取图线路，并提供请求编号。");
+    if (state === -2) return detail("RMBG_PROVIDER_RESULT_STORAGE_FAILED", "AOS 已完成处理，但上游保存结果图片失败。", "请联系管理员核对原任务结果，避免立即重复抠图。", "unknown");
+    if (state === -8) return detail("RMBG_PROVIDER_PROCESSING_TIMEOUT", "AOS 抠图处理超时，上游已返回失败状态。", "请稍后重试；若持续发生，请联系管理员并提供请求编号。");
+    if (state === -11) return detail("RMBG_PROVIDER_EMPTY_RESULT", "AOS 抠图结果为空，未能得到有效主体。", "请检查图片中的主体是否清晰，尝试使用主体更明确的图片。");
+    if ([-17, -16, -14, -10].includes(state)) return detail("RMBG_PROVIDER_INPUT_REJECTED", `AOS 拒绝处理参考图，图片内容未通过上游检查（状态 ${state}）。`, "请更换符合上游要求的参考图；如认为判断有误，请联系管理员核对请求编号。");
+    if (state === -15) return detail("RMBG_PROVIDER_RESOURCE_UNAVAILABLE", "AOS 处理资源不足，未能完成本次抠图。", "请稍后再试；持续失败时联系管理员检查上游服务。");
+    return detail("RMBG_PROVIDER_TASK_FAILED", getRequestErrorMessage(error) || `AOS 抠图任务失败（状态 ${state}）。`, "请联系管理员并提供请求编号，核对上游任务详情。");
+  }
+  if (/AOS任务创建失败（HTTP 413）/.test(text)) {
+    return detail("RMBG_PROVIDER_FILE_TOO_LARGE", "AOS 拒绝了参考图：文件超过上游大小限制（文件上传最大 50 MB）。", "请手动压缩文件后重新提交；若文件已小于限制，请联系管理员核对上游返回。");
+  }
+  if (/AOS任务创建失败（HTTP (400|401|404)）/.test(text)) {
+    return detail("RMBG_PROVIDER_REQUEST_REJECTED", getRequestErrorMessage(error) || "AOS 拒绝了抠图请求。", "请联系管理员核对上游参数、服务权限及接口配置，并提供请求编号。");
+  }
+  if (/AOS任务创建失败（HTTP (200|5\d\d)）/.test(text)) {
+    return detail("RMBG_PROVIDER_CREATE_UNCONFIRMED", getRequestErrorMessage(error) || "AOS 未能确认抠图任务是否创建成功。", "请联系管理员核对原请求，避免连续提交造成重复处理。", "unknown");
+  }
+  const aosReadFailure = text.match(/AOS(任务查询|结果下载)失败（HTTP (\d+)/);
+  if (aosReadFailure) {
+    return aosReadFailure[1] === "任务查询"
+      ? detail("RMBG_PROVIDER_POLL_FAILED", `AOS 查询抠图任务失败（HTTP ${aosReadFailure[2]}），原任务结果尚未确认。`, "请联系管理员核对原任务，不要重复提交。", "unknown")
+      : detail("RMBG_PROVIDER_RESULT_DOWNLOAD_FAILED", `抠图已完成，但结果图片下载失败（HTTP ${aosReadFailure[2]}）。`, "请联系管理员按请求编号取回原任务结果，避免重复抠图。", "unknown");
+  }
   if (isGatewayResponseTimeout(error)) {
     return detail("RESULT_UNCONFIRMED", "模型服务响应超时（HTTP 524），生成结果尚未确认。", "请先查看历史记录，避免重复提交。", "unknown");
   }
+  if (/AOS创建任务超时/.test(text)) {
+    return detail("RMBG_CREATE_TIMEOUT", "抠图服务创建任务超时（120秒），结果尚未确认。", "请先查看原任务或联系管理员核对；不要连续点击，以免重复处理。", "unknown");
+  }
+  if (/AOS创建任务连接失败/.test(text)) {
+    return detail("RMBG_CREATE_CONNECTION_FAILED", "抠图服务创建任务时连接中断，结果尚未确认。", "请先查看原任务或联系管理员核对；不要连续点击，以免重复处理。", "unknown");
+  }
+  if (/AOS查询任务连接失败/.test(text)) {
+    return detail("RMBG_POLL_CONNECTION_FAILED", "抠图服务查询任务时连接中断，原任务可能仍在处理。", "请保留当前页面并联系管理员核对原任务，避免重新提交。", "unknown");
+  }
+  if (/AOS查询任务超时/.test(text)) {
+    return detail("RMBG_POLL_TIMEOUT", "抠图服务查询任务超时，原任务可能仍在处理。", "请保留当前页面并联系管理员核对原任务，避免重新提交。", "unknown");
+  }
+  if (/AOS结果下载连接失败/.test(text)) {
+    return detail("RMBG_RESULT_DOWNLOAD_CONNECTION_FAILED", "抠图已完成，但结果图片传输中断。", "请联系管理员按请求编号取回原任务结果，避免重复抠图。", "unknown");
+  }
+  if (/AOS结果下载超时/.test(text)) {
+    return detail("RMBG_RESULT_DOWNLOAD_TIMEOUT", "抠图已完成，但结果图片下载超时。", "请联系管理员按请求编号取回原任务结果，避免重复抠图。", "unknown");
+  }
+  if (/提交生图前读取参考图超时/.test(text)) {
+    return detail("IMAGE_REFERENCE_READ_TIMEOUT", "提交生图前读取参考图超时，任务尚未提交。", "可以稍后重试。");
+  }
+  const errorName = isRecord(error) ? String(error.name || "") : "";
+  if (["AbortError", "TimeoutError"].includes(errorName) || /operation was aborted/i.test(text)) {
+    return detail("RESULT_UNCONFIRMED", errorName === "TimeoutError" ? "请求等待超时，任务结果尚未确认。" : "本次请求连接已中止，任务结果尚未确认。", "请先核对原任务或历史记录；持续没有结果时联系管理员，避免重复生成。", "unknown");
+  }
   if ((isRecord(error) && error.providerOutcomeUnknown === true) || /结果(?:尚)?未确认|结果暂未确认|request_outcome_unknown|任务执行中断|may still be running/i.test(text)) {
     return detail("RESULT_UNCONFIRMED", "任务结果尚未确认，可能仍在处理。", "请先查看原任务或历史记录；持续没有结果时联系管理员，避免重复生成。", "unknown");
   }
@@ -243,9 +312,15 @@ export function getRequestFailureDetails(
   if (/content.?polic|moderation|safety|policy_rejected|内容(?:敏感|审核|限制)|不能生成像那样|不能生成那样|违规/i.test(text)) {
     return detail("CONTENT_POLICY_REJECTED", "模型服务因内容审核限制拒绝了本次请求。", "请调整描述或参考图中的受限内容后再提交；重复提交相同内容通常无法解决。");
   }
+  if (/旧存储已停用|storage_retired/i.test(text)) {
+    return detail("SOURCE_STORAGE_RETIRED", "参考文件所在的旧存储已停用，且没有可用的归档副本。", "请重新上传原始文件后再提交；切换模型或重复提交无法恢复该文件。");
+  }
   if (/上传到存储桶失败|存储.*失败|归档.*失败|archive.*failed|storage.*failed/i.test(text)) {
     return detail("RESULT_STORAGE_FAILED", "处理结果保存失败，生成结果可能已经存在。", "请保留当前页面并联系管理员提供请求编号，先不要重复生成。", "unknown");
   }
+  if (/failed to download (?:the )?image url|failed to download.*reference.*image/i.test(text)) {
+    return detail("PROVIDER_REFERENCE_FETCH_FAILED", "模型服务未能读取参考图。", "请重新上传参考图或切换模型后再提交；若原图仍可打开，请联系管理员检查模型取图线路，并提供请求编号。");
+  }
   if (/参考图.*(?:下载失败|不可|失效)|无法获取图片|图片(?:源文件|链接).*不可|获取图片.*失败|get image url failed/i.test(text)) {
     return detail("SOURCE_IMAGE_UNAVAILABLE", "请求中的图片无法读取，链接可能已失效或没有访问权限。", "请重新上传原图后再提交；若原图仍可打开，请联系管理员检查取图服务。");
   }

lib/scene-fusion/preprocess-product.ts

@@ -0,0 +1,37 @@
+import { executeRemoveBackgroundPOST } from "@/lib/canvas/operations/rmbg";
+import { createLogger } from "@/lib/observability/logger";
+
+const logger = createLogger("scene-fusion");
+
+export async function preprocessProductImageWithRmbg(params: {
+  request: Request;
+  requestId: string;
+  userId: string;
+  productImageUrl: string;
+  preRmbgEnabled: boolean;
+}): Promise<{ productImageUrl: string; usedPreRmbg: boolean; provider?: string; reason?: string }> {
+  const { request, requestId, userId, productImageUrl, preRmbgEnabled } = params;
+  if (!preRmbgEnabled) return { productImageUrl, usedPreRmbg: false, reason: "disabled_by_config" };
+
+  logger.info("pre_rmbg_started", { requestId });
+  try {
+    const response = await executeRemoveBackgroundPOST(new Request(new URL("/api/rmbg", request.url), {
+      method: "POST",
+      headers: { "Content-Type": "application/json", "X-Request-ID": `${requestId}:pre-rmbg` },
+      body: JSON.stringify({ imageUrl: productImageUrl, prompt: "场景裂变预处理-抠图", skipGallerySave: true }),
+    }), userId);
+    const payload = await response.json();
+    if (!response.ok) {
+      logger.warn("pre_rmbg_failed", { requestId, status: response.status, code: payload?.failure?.code });
+      return { productImageUrl, usedPreRmbg: false, reason: String(payload?.error || `request_failed_${response.status}`) };
+    }
+    const cleanedUrl = String(payload?.original_url || payload?.thumbnail_url || "").trim();
+    if (!cleanedUrl || cleanedUrl === productImageUrl) {
+      return { productImageUrl, usedPreRmbg: false, reason: cleanedUrl ? "same_as_source" : "empty_result" };
+    }
+    return { productImageUrl: cleanedUrl, usedPreRmbg: true, provider: String(payload?.provider || "unknown") };
+  } catch (error) {
+    logger.warn("pre_rmbg_failed", error, { requestId });
+    return { productImageUrl, usedPreRmbg: false, reason: error instanceof Error ? error.message : "exception" };
+  }
+}

lib/storage/canvas-cdn-download.ts

@@ -10,17 +10,21 @@ export async function resolveCanvasCdnDownload(urls: string[], filename: string)
   })));
   const task = await findImageArchiveDownloadTask(sources, true);
   const asset = (task?.metadata as { downloadAsset?: { status?: string; url?: string; contentType?: string; bytes?: number } } | null)?.downloadAsset;
-  if (asset?.status !== "ready" || !asset.url || asset.contentType !== "image/png") return { task, direct: null };
+  if (!task) return { task, direct: null, canPrepareDirect: false };
   const config = await getDefaultStorageConfig();
-  if (config?.type !== "qiniu-kodo" || !config.publicUrl || !config.isEnabled) return { task, direct: null };
+  if (config?.type !== "qiniu-kodo" || !config.publicUrl || !config.isEnabled) return { task, direct: null, canPrepareDirect: false };
-  const url = new URL(asset.url);
+  const ready = asset?.status === "ready" && asset.url && asset.contentType === "image/png";
+  const source = ready ? asset.url : task.targetUrl;
+  if (!source) return { task, direct: null, canPrepareDirect: false };
+  const url = new URL(source);
   const base = new URL(config.publicUrl);
   const origin = process.env.CANVAS_QINIU_ORIGIN_URL;
   if (origin && url.origin === new URL(origin).origin) url.host = base.host;
   if (base.protocol !== "https:" || url.origin !== base.origin
-      || !(url.pathname.startsWith(base.pathname.replace(/\/$/, "") + "/"))) return { task, direct: null };
+      || !(url.pathname.startsWith(base.pathname.replace(/\/$/, "") + "/"))) return { task, direct: null, canPrepareDirect: false };
+  if (!ready) return { task, direct: null, canPrepareDirect: true };
   // attname is interpreted by Kodo/CDN as Content-Disposition, including Chinese
   // filenames. Keep all processing/auth parameters intact for correct cache keys.
   url.searchParams.set("attname", filename);
-  return { task, direct: { delivery: "cdn", downloadUrl: url.toString(), filename, bytes: asset.bytes || 0 } };
+  return { task, direct: { delivery: "cdn", downloadUrl: url.toString(), filename, bytes: asset?.bytes || 0 }, canPrepareDirect: true };
 }

lib/storage/canvas-zip-delivery.ts

@@ -1,11 +1,72 @@
 import "server-only";
 import { createReadStream } from "node:fs";
-import { PutObjectCommand } from "@aws-sdk/client-s3";
+import { open } from "node:fs/promises";
+import { AbortMultipartUploadCommand, CompleteMultipartUploadCommand, CreateMultipartUploadCommand, HeadObjectCommand, PutObjectCommand, UploadPartCommand, type S3Client } from "@aws-sdk/client-s3";
 import { getDefaultStorageConfig, getStorageConfigById } from "@/lib/db/queries";
 import { createS3Client, toDbS3UploadConfig, buildS3PublicUrl } from "./service";
 
-/** Only a completely written archive is uploaded. Local GET remains a fallback. */
+type ZipPublication = { id: string; path: string; bytes: number; disposition: string; onProgress?: (bytes: number) => Promise<void> };
-export async function publishCanvasZip(params: { id: string; path: string; bytes: number; disposition: string }) {
+const PART_BYTES = 8 * 1024 ** 2;
+
+async function uploadZip(client: S3Client, bucket: string, key: string, params: ZipPublication) {
+  const metadata = { Bucket: bucket, Key: key, ContentType: "application/zip", ContentDisposition: params.disposition, CacheControl: "public, max-age=1800" };
+  if (params.bytes <= 2 * PART_BYTES) {
+    const body = createReadStream(params.path);
+    try {
+      await client.send(new PutObjectCommand({ ...metadata, Body: body, ContentLength: params.bytes }), { abortSignal: AbortSignal.timeout(90_000) });
+      await params.onProgress?.(params.bytes);
+    } finally { body.destroy(); }
+    return;
+  }
+  const initiated = await client.send(new CreateMultipartUploadCommand(metadata), { abortSignal: AbortSignal.timeout(15_000) });
+  if (!initiated.UploadId) throw new Error("七牛未返回分片上传编号");
+  const upload = { Bucket: bucket, Key: key, UploadId: initiated.UploadId };
+  const handle = await open(params.path, "r").catch(async error => {
+    await client.send(new AbortMultipartUploadCommand(upload), { abortSignal: AbortSignal.timeout(10_000) }).catch(() => undefined);
+    throw error;
+  });
+  const parts: Array<{ PartNumber: number; ETag: string }> = [];
+  let cursor = 0;
+  let uploaded = 0;
+  let progress = Promise.resolve();
+  const controller = new AbortController();
+  try {
+    const workers = await Promise.allSettled(Array.from({ length: 3 }, async () => {
+      try {
+        while (!controller.signal.aborted) {
+          const index = cursor++;
+          const start = index * PART_BYTES;
+          if (start >= params.bytes) return;
+          const body = Buffer.allocUnsafe(Math.min(PART_BYTES, params.bytes - start));
+          let read = 0;
+          while (read < body.length) {
+            const result = await handle.read(body, read, body.length - read, start + read);
+            if (!result.bytesRead) throw new Error("完整 ZIP 文件读取中断，请重试下载");
+            read += result.bytesRead;
+          }
+          const part = await client.send(new UploadPartCommand({ ...upload, PartNumber: index + 1, Body: body, ContentLength: body.length }), {
+            abortSignal: AbortSignal.any([controller.signal, AbortSignal.timeout(180_000)]),
+          });
+          if (!part.ETag) throw new Error("七牛未确认上传分片");
+          parts.push({ PartNumber: index + 1, ETag: part.ETag });
+          uploaded += body.length;
+          const bytes = uploaded;
+          progress = progress.then(() => params.onProgress?.(bytes));
+          await progress;
+        }
+      } catch (error) { controller.abort(); throw error; }
+    }));
+    const failure = workers.find(worker => worker.status === "rejected");
+    if (failure?.status === "rejected") throw failure.reason;
+    await client.send(new CompleteMultipartUploadCommand({ ...upload, MultipartUpload: { Parts: parts.sort((a, b) => a.PartNumber - b.PartNumber) } }), { abortSignal: AbortSignal.timeout(30_000) });
+  } catch (error) {
+    await client.send(new AbortMultipartUploadCommand(upload), { abortSignal: AbortSignal.timeout(10_000) }).catch(() => undefined);
+    throw error;
+  } finally { await handle.close(); }
+}
+
+/** Publish the complete ZIP before offering the accelerated download. */
+export async function publishCanvasZip(params: ZipPublication) {
   const raw = await getDefaultStorageConfig();
   const config = toDbS3UploadConfig(raw);
   if (config?.provider !== "qiniu-kodo" || !config.publicUrl?.startsWith("https://")) return null;
@@ -13,20 +74,37 @@ export async function publishCanvasZip(params: { id: string; path: string; bytes
   const client = createS3Client(config);
   // Qiniu's S3 endpoint expects an ordinary known-length body, without AWS trailers.
   client.config.requestChecksumCalculation = async () => "WHEN_REQUIRED";
-  const body = createReadStream(params.path);
+  let phase: "check" | "upload" | "verify" = "check";
+  const startedAt = Date.now();
+  let uploadedBytes = 0;
   try {
-    await client.send(new PutObjectCommand({ Bucket: config.bucket, Key: key, Body: body,
+    const existing = await client.send(new HeadObjectCommand({ Bucket: config.bucket, Key: key }), { abortSignal: AbortSignal.timeout(15_000) }).catch(error => {
-      ContentLength: params.bytes, ContentType: "application/zip", ContentDisposition: params.disposition,
+      if (error.$metadata?.httpStatusCode === 404) return null;
-      CacheControl: "public, max-age=1800" }), { abortSignal: AbortSignal.timeout(90_000) });
+      throw error;
-    const url = buildS3PublicUrl(config, key);
+    });
+    if (existing?.ContentLength !== params.bytes) {
+      phase = "upload";
+      await uploadZip(client, config.bucket, key, { ...params, onProgress: async bytes => {
+        uploadedBytes = bytes;
+        await params.onProgress?.(bytes);
+      } });
+    }
+    phase = "verify";
+    const target = new URL(buildS3PublicUrl(config, key));
+    target.searchParams.set("v", String(params.bytes));
+    const url = target.toString();
     const response = await fetch(url, { method: "HEAD", redirect: "error", signal: AbortSignal.timeout(10_000) });
     const length = Number(response.headers.get("content-length"));
     if (!response.ok || length !== params.bytes) throw new Error("CDN object is not ready");
     return { url, storageConfigId: raw!.id, key };
   } catch (error) {
-    console.warn("[CanvasDownloadZipTask] CDN upload/check failed; using complete local file", { taskId: params.id, kind: (error as Error).name });
+    const kind = (error as Error).name;
-    return { url: null, storageConfigId: raw!.id, key };
+    const status = (error as { $metadata?: { httpStatusCode?: number } }).$metadata?.httpStatusCode;
-  } finally { body.destroy(); client.destroy(); }
+    console.warn("[CanvasDownloadZipTask] CDN publication failed", { taskId: params.id, phase, kind, status, bytes: params.bytes, uploadedBytes, elapsedMs: Date.now() - startedAt });
+    const reason = status === 401 || status === 403 ? `七牛拒绝访问（HTTP ${status}），请管理员检查存储权限` : phase === "check" ? "暂时无法确认七牛文件状态" : phase === "verify" ? "七牛下载链接尚未可用" : /AbortError|TimeoutError/.test(kind) ? "传送至七牛时超时" : "传送至七牛失败";
+    const advice = status === 401 || status === 403 ? "存储权限恢复后再次点击下载即可继续传送原 ZIP" : "请再次点击下载以继续传送原 ZIP";
+    return { url: null, storageConfigId: raw!.id, key, error: `ZIP 已打包完成，但${reason}。${advice}；不会重新生成图片。若持续失败，请联系管理员并提供下载编号：${params.id}` };
+  } finally { client.destroy(); }
 }
 
 export async function removeCanvasZipObject(object: { storageConfigId: string; key: string }) {

lib/storage/image-archive-db.ts

@@ -1,5 +1,5 @@
 import "server-only";
-import { isRetiredStorageUrl } from "./retired-storage";
+import { isRetiredStorageUrl, normalizeLegacyAliyunStorageUrl, RETIRED_STORAGE_MESSAGE } from "./retired-storage";
 
 import { createHash } from "node:crypto";
 import {
@@ -22,6 +22,8 @@ export function getImageArchiveDisplayHoldMs() {
 }
 
 export function imageArchiveSourceKey(source: string) {
+  const legacy = normalizeLegacyAliyunStorageUrl(source);
+  if (legacy) return legacy;
   if (!source.startsWith("data:")) return source;
   const configured =
     process.env.NEXT_PUBLIC_APP_URL || process.env.AUTH_URL || process.env.NEXTAUTH_URL;
@@ -39,7 +41,7 @@ export async function enqueueImageArchiveTask(params: {
   metadata?: Record<string, unknown> | null;
 }) {
   const sourceUrl = String(params.sourceUrl || "").trim();
-  if (!isGeneratedImageSource(sourceUrl) || isRetiredStorageUrl(sourceUrl)) return null;
+  if (!isGeneratedImageSource(sourceUrl) || isRetiredStorageUrl(sourceUrl) || normalizeLegacyAliyunStorageUrl(sourceUrl)) return null;
 
   const now = new Date();
   const archiveAfterAt = params.archiveAfterAt || now;
@@ -136,6 +138,7 @@ export async function markImageArchiveTaskStored(params: {
   id: string;
   targetUrl: string;
   targetStorageConfigId?: string | null;
+  downloadAsset?: import("./qiniu-image-archive").ReadyImageDownload;
 }) {
   await db
     .update(imageArchiveTask)
@@ -143,7 +146,7 @@ export async function markImageArchiveTaskStored(params: {
       status: "stored",
       targetUrl: params.targetUrl,
       targetStorageConfigId: params.targetStorageConfigId || null,
-      metadata: sql`coalesce(${imageArchiveTask.metadata}, '{}'::jsonb) || jsonb_build_object('downloadAsset', jsonb_build_object('status', 'pending'))`,
+      metadata: sql`coalesce(${imageArchiveTask.metadata}, '{}'::jsonb) || jsonb_build_object('downloadAsset', ${JSON.stringify(params.downloadAsset ?? { status: "pending" })}::jsonb)`,
       archivedAt: new Date(),
       replaceAfterAt: new Date(),
       lastError: null,
@@ -312,6 +315,18 @@ export async function getArchivedImageUrlMappings(
   return replacements;
 }
 
+/** Legacy OSS is unavailable; only an existing durable copy can serve its URLs. */
+export async function resolveLegacyAliyunStorageUrl(source: string): Promise<string> {
+  const legacy = normalizeLegacyAliyunStorageUrl(source);
+  if (!legacy) return source;
+  const mappings = await getArchivedImageUrlMappings([source, legacy]);
+  const target = mappings[source] || mappings[legacy];
+  if (!target || normalizeLegacyAliyunStorageUrl(target) || isRetiredStorageUrl(target)) {
+    throw new Error(`HTTP 410: ${RETIRED_STORAGE_MESSAGE}`);
+  }
+  return target;
+}
+
 // Normalize late writes too: an archive can finish before a task/canvas save arrives.
 export async function resolveArchivedImageUrls<T>(
   value: T,

lib/storage/image-archive-urls.ts

@@ -1,5 +1,6 @@
 // Shared by the server and canvas; no storage or network work happens here.
 export type ArchivedImageUrlMap = Record<string, string>;
+const legacyOssUrlPattern = /https?:\/\/demo-sparkai\.oss-cn-shanghai\.aliyuncs\.com\/[^\s"'<>`\\)\]}|]+/gi;
 
 export function isGeneratedImageSource(value: string) {
   return (
@@ -11,6 +12,7 @@ export function collectImageArchiveSources(value: unknown): string[] {
   const urls = new Set<string>();
   const visit = (item: unknown) => {
     if (typeof item === "string") {
+      for (const match of item.matchAll(legacyOssUrlPattern)) urls.add(match[0].replace(/,+$/, ""));
       if (isGeneratedImageSource(item)) urls.add(item);
       else
         for (const match of item.matchAll(/!\[[^\]]*\]\(([^)]+)\)/g)) {
@@ -35,6 +37,10 @@ export function replaceArchivedImageUrls<T>(value: T, replacements: ArchivedImag
         .map((part) => replacements[part] || part)
         .join("|||");
       return `![${nextAlt}](${replacements[url] || url})`;
+    }).replace(legacyOssUrlPattern, (url) => {
+      if (replacements[url]) return replacements[url];
+      const source = url.replace(/,+$/, "");
+      return (replacements[source] || source) + url.slice(source.length);
     }) as T;
   }
   if (!value || typeof value !== "object" || value instanceof Date) return value;

lib/storage/image-archive.ts

@@ -12,6 +12,7 @@ import {
   imageArchiveSourceKey,
 } from "@/lib/storage/image-archive-db";
 import { uploadFile } from "@/lib/storage/service";
+import { archiveImageThroughQiniu } from "./qiniu-image-archive";
 
 const logger = createLogger("image-archive");
 
@@ -182,7 +183,7 @@ export async function downloadTemporaryImage(params: { sourceUrl: string; retrie
       });
       return { ...data, extension: getImageExtension(data.contentType, params.sourceUrl) };
     } catch (error) {
-      if (attempt >= retries) throw error;
+      if (attempt >= retries || /\bHTTP (?:404|410)\b/.test(String(error))) throw error;
       await new Promise((resolve) => setTimeout(resolve, 1000 * (attempt + 1)));
     }
   }
@@ -190,7 +191,14 @@ export async function downloadTemporaryImage(params: { sourceUrl: string; retrie
   throw new Error("Image download failed");
 }
 
-export async function archiveTemporaryImage(sourceUrl: string) {
+export async function archiveTemporaryImage(sourceUrl: string, archiveId?: string) {
+  if (archiveId) {
+    const direct = await archiveImageThroughQiniu(sourceUrl, archiveId).catch(error => {
+      logger.warn("cloud_archive_fallback", error, { archiveId });
+      return null;
+    });
+    if (direct) return direct;
+  }
   const downloaded = await downloadTemporaryImage({ sourceUrl });
   const objectSuffix = `${Date.now()}-${randomUUID()}`;
   const filename = `ai-generated-archive-${objectSuffix}.${downloaded.extension}`;
@@ -202,5 +210,6 @@ export async function archiveTemporaryImage(sourceUrl: string) {
     pathname: uploaded.pathname,
     contentType: uploaded.contentType,
     bytes: downloaded.buffer.length,
+    downloadAsset: undefined,
   };
 }

lib/storage/image-byte-cache.ts

@@ -1,5 +1,5 @@
 import "server-only";
-import { isRetiredStorageUrl, RETIRED_STORAGE_MESSAGE } from "./retired-storage";
+import { isRetiredStorageUrl, normalizeLegacyAliyunStorageUrl, RETIRED_STORAGE_MESSAGE } from "./retired-storage";
 import { createHash, randomUUID } from "node:crypto";
 import { mkdir, readFile, writeFile, rename, readdir, stat, statfs, unlink } from "node:fs/promises";
 import { join } from "node:path";
@@ -81,18 +81,25 @@ function isMediaResponse(data: ImageBytes) {
   if (/^<\?xml/i.test(prefix) && !/<svg[\s>]/i.test(prefix)) return false;
   return data.buffer.length > 0;
 }
-export async function fetchImageBytes(url: string, options: { headers?: HeadersInit; timeoutMs?: number; scope?: string } = {}) {
+export async function fetchImageBytes(url: string, options: { headers?: HeadersInit; timeoutMs?: number; scope?: string; signal?: AbortSignal } = {}) {
   if (isRetiredStorageUrl(url)) throw new Error(`HTTP 410: ${RETIRED_STORAGE_MESSAGE}`);
-  return onceImageBytes(`source:${options.scope || ""}:${url}`, async () => {
+  let sourceUrl = url;
-    if (url.startsWith("data:")) {
+  if (normalizeLegacyAliyunStorageUrl(url)) {
-      const match = url.match(/^data:(image\/[a-z0-9.+-]+);base64,([a-z0-9+/=]+)$/i);
+    const { resolveLegacyAliyunStorageUrl } = await import("./image-archive-db");
+    sourceUrl = await resolveLegacyAliyunStorageUrl(url);
+  }
+  return onceImageBytes(`source:${options.scope || ""}:${sourceUrl}`, async () => {
+    if (sourceUrl.startsWith("data:")) {
+      const match = sourceUrl.match(/^data:(image\/[a-z0-9.+-]+);base64,([a-z0-9+/=]+)$/i);
       if (!match) throw new Error("Invalid inline generated image");
       return { buffer: Buffer.from(match[2], "base64"), contentType: match[1] };
     }
-    const response = await fetch(url, {
+    const response = await fetch(sourceUrl, {
       headers: options.headers, cache: "no-store", redirect: "follow",
       // The deadline covers the body as well as the response headers.
-      signal: AbortSignal.timeout(options.timeoutMs || 60_000),
+      signal: options.signal
+        ? AbortSignal.any([options.signal, AbortSignal.timeout(options.timeoutMs || 60_000)])
+        : AbortSignal.timeout(options.timeoutMs || 60_000),
     });
     if (!response.ok) { await response.body?.cancel(); throw new Error(`HTTP ${response.status}`); }
     const buffer = Buffer.from(await response.arrayBuffer());