fix: improve detail stitch and model recovery

app/api/agent-workflow/detail-stitch/route.ts

@@ -20,12 +20,13 @@ type StitchSourceSegment = {
   card: StitchReferenceInput;
   top: number;
   height: number;
+  sourceWidth?: number;
+  sourceHeight?: number;
 };
 
 const MAX_REFERENCE_COUNT = 120;
 const FETCH_TIMEOUT_MS = 10000;
 const FETCH_CONCURRENCY = 32;
-const TRANSFORM_CONCURRENCY = 10;
 const SLICE_UPLOAD_CONCURRENCY = 10;
 const PREVIEW_MAX_WIDTH = 720;
 const PREVIEW_MIN_WIDTH = 96;
@@ -250,73 +251,26 @@ async function prepareStitch(params: {
   const sourceSegments: StitchSourceSegment[] = [];
   const defaultCutLines: number[] = [];
 
-  const resizedItems = await runBoundedParallel(loaded, TRANSFORM_CONCURRENCY, async (item, loadedIndex) => {
+  loaded.forEach((item, index) => {
     const height = Math.max(1, Math.round((previewWidth / Math.max(item.width, 1)) * item.height));
-    const resized = await sharp(item.buffer, { failOn: "none" })
-      .rotate()
-      .resize(previewWidth, height, {
-        fit: "fill",
-        withoutEnlargement: false,
-      })
-      .jpeg({
-        quality: 76,
-        mozjpeg: true,
-        progressive: true,
-      })
-      .toBuffer();
-
-    return {
-      input: resized,
-      top: 0,
-      left: 0,
-      height,
-      loadedIndex,
-      card: item.card,
-    };
-  });
-
-  const compositeItems = resizedItems.map((item, index) => {
     const currentTop = top;
-    top += item.height;
+    top += height;
-    if (index < resizedItems.length - 1) {
+    if (index < loaded.length - 1) {
       defaultCutLines.push(top);
     }
     sourceSegments.push({
       card: item.card,
       top: currentTop,
-      height: item.height,
+      height,
+      sourceWidth: item.width,
+      sourceHeight: item.height,
     });
-    return {
-      input: item.input,
-      top: currentTop,
-      left: 0,
-    };
   });
 
   const previewHeight = Math.max(1, top);
-  const previewBuffer = await sharp({
-    create: {
-      width: previewWidth,
-      height: previewHeight,
-      channels: 3,
-      background: "#ffffff",
-    },
-  })
-    .composite(compositeItems)
-    .jpeg({
-      quality: 76,
-      mozjpeg: true,
-      progressive: true,
-    })
-    .toBuffer();
-
-  const upload = await uploadFile(
-    `detail-stitch-preview-${Date.now()}-${Math.random().toString(36).slice(2, 8)}.jpg`,
-    bufferToArrayBuffer(previewBuffer),
-  );
 
   return {
-    previewUrl: upload.url,
+    previewUrl: "",
     width: previewWidth,
     height: previewHeight,
     defaultCutLines,
@@ -349,10 +303,36 @@ async function applyStitch(params: {
   }));
   const passthroughSet = new Set(params.passthroughSegmentIndexes);
   const segmentMatches = segments.map((segment) => findMatchingSourceSegment(segment, params.sourceSegments));
-  const needsCropping = segmentMatches.some((match) => !match);
+  const preparedSourceCache = new Map<string, Promise<Buffer>>();
-  const previewBuffer = needsCropping
+
-    ? await fetchImageBuffer(params.previewUrl, params.requestOrigin, params.cookie)
+  const getPreparedSourceBuffer = (source: StitchSourceSegment) => {
-    : null;
+    const sourceUrl = source.card.imageUrl;
+    const key = `${sourceUrl}|${params.width}|${source.height}`;
+    const cached = preparedSourceCache.get(key);
+    if (cached) return cached;
+
+    const prepared = (async () => {
+      const buffer = await fetchImageBuffer(
+        buildReferenceFetchUrl(sourceUrl),
+        params.requestOrigin,
+        params.cookie,
+      );
+      return sharp(buffer, { failOn: "none" })
+        .rotate()
+        .resize(params.width, source.height, {
+          fit: "fill",
+          withoutEnlargement: false,
+        })
+        .jpeg({
+          quality: 88,
+          mozjpeg: true,
+          progressive: true,
+        })
+        .toBuffer();
+    })();
+    preparedSourceCache.set(key, prepared);
+    return prepared;
+  };
 
   const cards = await runBoundedParallel(segments, SLICE_UPLOAD_CONCURRENCY, async (segment) => {
     const matchedSource = segmentMatches[segment.index] || null;
@@ -367,21 +347,65 @@ async function applyStitch(params: {
       };
     }
 
-    const safeTop = Math.max(0, Math.min(params.height - 1, Math.round(segment.top)));
+    const segmentTop = Math.max(0, Math.round(segment.top));
-    const safeHeight = Math.max(
+    const segmentHeight = Math.max(
       1,
-      Math.min(params.height - safeTop, Math.round(segment.height)),
+      Math.min(params.height - segmentTop, Math.round(segment.height)),
     );
-    if (!previewBuffer) {
+    const segmentBottom = segmentTop + segmentHeight;
-      throw new Error("拼合预览图不可用");
+    const overlappingSources = params.sourceSegments.filter((source) => {
+      const sourceTop = Math.round(source.top);
+      const sourceBottom = sourceTop + Math.round(source.height);
+      return sourceTop < segmentBottom && sourceBottom > segmentTop;
+    });
+
+    if (overlappingSources.length === 0) {
+      throw new Error("当前切片没有匹配到原始参考图");
     }
-    const sliceBuffer = await sharp(previewBuffer, { failOn: "none" })
+
-      .extract({
+    const compositeItems = await Promise.all(
-        left: 0,
+      overlappingSources.map(async (source) => {
-        top: safeTop,
+        const sourceTop = Math.round(source.top);
+        const sourceHeight = Math.max(1, Math.round(source.height));
+        const overlapTop = Math.max(segmentTop, sourceTop);
+        const overlapBottom = Math.min(segmentBottom, sourceTop + sourceHeight);
+        const cropTop = Math.max(0, Math.min(sourceHeight - 1, overlapTop - sourceTop));
+        const cropHeight = Math.max(
+          1,
+          Math.min(sourceHeight - cropTop, Math.round(overlapBottom - overlapTop)),
+        );
+        const sourceBuffer = await getPreparedSourceBuffer(source);
+        const input = await sharp(sourceBuffer, { failOn: "none" })
+          .extract({
+            left: 0,
+            top: cropTop,
+            width: params.width,
+            height: cropHeight,
+          })
+          .jpeg({
+            quality: 88,
+            mozjpeg: true,
+            progressive: true,
+          })
+          .toBuffer();
+
+        return {
+          input,
+          top: Math.max(0, Math.round(overlapTop - segmentTop)),
+          left: 0,
+        };
+      }),
+    );
+
+    const sliceBuffer = await sharp({
+      create: {
         width: params.width,
-        height: safeHeight,
+        height: segmentHeight,
-      })
+        channels: 3,
+        background: "#ffffff",
+      },
+    })
+      .composite(compositeItems)
       .jpeg({
         quality: 88,
         mozjpeg: true,
@@ -445,12 +469,16 @@ export async function POST(request: NextRequest) {
           const imageUrl = resolveHttpUrl(rawCard.imageUrl, requestOrigin);
           const top = Math.round(Number(raw.top));
           const segmentHeight = Math.round(Number(raw.height));
+          const sourceWidth = Math.round(Number(raw.sourceWidth));
+          const sourceHeight = Math.round(Number(raw.sourceHeight));
           if (!imageUrl || !Number.isFinite(top) || !Number.isFinite(segmentHeight)) {
             return null;
           }
           return {
             top,
             height: Math.max(1, segmentHeight),
+            sourceWidth: Number.isFinite(sourceWidth) && sourceWidth > 0 ? sourceWidth : undefined,
+            sourceHeight: Number.isFinite(sourceHeight) && sourceHeight > 0 ? sourceHeight : undefined,
             card: {
               id: String(rawCard.id || "").trim() || `source-${top}`,
               label: String(rawCard.label || "").trim() || "参考图",
@@ -466,7 +494,7 @@ export async function POST(request: NextRequest) {
         })
         .filter((item): item is StitchSourceSegment => Boolean(item));
 
-      if (!previewUrl || !width || !height || sourceSegments.length === 0) {
+      if (!width || !height || sourceSegments.length === 0) {
         return NextResponse.json({ success: false, error: "缺少切割参数" }, { status: 400 });
       }
 

app/api/image-proxy/route.ts

@@ -192,16 +192,19 @@ export async function GET(request: NextRequest) {
   const quality = requestedQuality ? clamp(requestedQuality, MIN_QUALITY, MAX_QUALITY) : DEFAULT_QUALITY;
   const directQuality = requestedQuality ? clamp(requestedQuality, MIN_QUALITY, MAX_QUALITY) : null;
   const requestedFormat = searchParams.get("f");
+  const forceProxy = searchParams.get("proxy") === "1";
 
-  const directImageTarget = resolveDirectImageTarget(
+  if (!forceProxy) {
-    request,
+    const directImageTarget = resolveDirectImageTarget(
-    target,
+      request,
-    width,
+      target,
-    directQuality,
+      width,
-    requestedFormat
+      directQuality,
-  );
+      requestedFormat
-  if (directImageTarget) {
+    );
-    return redirectToDirectImage(directImageTarget);
+    if (directImageTarget) {
+      return redirectToDirectImage(directImageTarget);
+    }
   }
 
   const cacheKey = `${target.toString()}|${width || "auto"}|${quality}|${requestedFormat || "auto"}`;

app/api/scene-fusion/route.ts

@@ -32,10 +32,6 @@ import {
   type SceneFusionImageGenConfig,
 } from "@/lib/scene-fusion/output-capabilities";
 import { acquireCanvasImageModelSlot } from "@/lib/canvas/image-concurrency";
-import {
-  recordAiModelHealthFailure,
-  recordAiModelHealthSuccess,
-} from "@/lib/ai/runtime/model-health";
 
 // 请求体 Schema
 const sceneFusionRequestSchema = z.object({
@@ -55,7 +51,7 @@ const sceneFusionRequestSchema = z.object({
 type SceneFusionMode = "scene-fission" | "multi-product-scene" | "random-bg";
 
 // 默认提示词（当数据库未配置时使用）- 使用"参考"的表述方式
-const FALLBACK_PROMPT = "请参考第一张图片中的产品，将其自然地融合到第二张图片的场景中。要求：1)保持产品的整体外观、颜色、形状和设计风格与第一张图一致；2)调整产品的大小和角度以适应场景；3)注意光影和透视关系使融合自然。";
+const FALLBACK_PROMPT = "请参考第一张图片中的产品，将其自然地融合到第二张图片的场景中。要求：1)必须保持产品的核心结构、轮廓比例、部件数量、材质颜色和设计细节与第一张图一致；2)允许为了匹配参考场景调整产品角度、朝向、大小和透视，不要把角度变化当成结构改变；3)注意光影和透视关系使融合自然。";
 
 const SCENE_FUSION_MODEL_COOLDOWN_MS = 2 * 60 * 1000;
 const SCENE_FUSION_MAX_ITEMS = 10;
@@ -68,9 +64,9 @@ const SCENE_FUSION_ECHO_HASH_TIMEOUT_MS = 20_000;
 const SCENE_FUSION_ECHO_HASH_THRESHOLD = 8;
 const SCENE_FUSION_REVIEW_TIMEOUT_MS = 25_000;
 const SCENE_FUSION_STRICT_PROMPT_TAIL =
-  "硬性要求：严禁直接返回第一张参考图（产品图）原图，必须保留第二张图的场景与构图，仅替换目标主体；结果中不得同时完整保留原目标主体与新产品；若识别不确定，请优先保持第二张图背景不变并完成主体替换。";
+  "硬性要求：严禁直接返回第一张参考图（产品图）原图，必须保留第二张图的场景与构图，仅替换目标主体；结果中不得同时完整保留原目标主体与新产品；产品可因场景透视调整角度、朝向和大小，但核心结构、轮廓比例、部件关系、材质颜色不得被改造；若识别不确定，请优先保持第二张图背景不变并完成主体替换。";
 const SCENE_FUSION_RANDOM_BG_PROMPT_TAIL =
-  "硬性要求：背景必须与原图明显不同（颜色、结构、元素至少两项显著变化），禁止保留原背景纹理或直接回传原图；仅保留产品主体并保证主体边缘完整自然。";
+  "硬性要求：背景必须与原图明显不同（颜色、结构、元素至少两项显著变化），禁止保留原背景纹理或直接回传原图；仅保留产品主体并保证主体结构、轮廓比例、部件关系和边缘完整自然，允许为新背景调整朝向、角度和透视。";
 let sceneFusionRoundRobinCursor = 0;
 type SceneFusionModelCooldown = Map<string, number>;
 
@@ -533,12 +529,14 @@ async function reviewSceneFusionResult(params: {
     locationHints ? `定位提示：${locationHints}` : "",
     "请严格判断图3是否同时满足以下条件：",
     `1. 图3里已经出现了与图1同主体的${productLabel}`,
-    `2. 图2原本需要被替换的${targetLabel}没有被完整保留下来`,
+    `2. 图3中的${productLabel}核心结构、轮廓比例、部件数量、材质颜色和主要设计细节与图1一致`,
-    "3. 图2的大部分场景构图、机位和背景仍被保留，只做主体替换",
+    `3. 图2原本需要被替换的${targetLabel}没有被完整保留下来`,
-    "4. 图3不是图1产品原图、裁切图或仅做轻微背景变化的回传图",
+    "4. 图2的大部分场景构图、机位和背景仍被保留，只做主体替换",
+    "5. 图3不是图1产品原图、裁切图或仅做轻微背景变化的回传图",
+    "注意：为了匹配图2的机位和参考图角度，产品朝向、旋转、透视、大小变化是允许的；不要仅因为角度不同判失败。",
     "若任一条件不满足，就判定为 failed。",
     "仅返回 JSON：",
-    '{"passed":true,"score":0.0,"productMatched":true,"targetRemoved":true,"scenePreserved":true,"suspectedEcho":false,"reason":"一句话说明","confidence":0.0}',
+    '{"passed":true,"score":0.0,"productMatched":true,"productStructurePreserved":true,"angleAcceptable":true,"targetRemoved":true,"scenePreserved":true,"suspectedEcho":false,"reason":"一句话说明","confidence":0.0}',
   ]
     .filter(Boolean)
     .join("\n");
@@ -562,6 +560,10 @@ async function reviewSceneFusionResult(params: {
     const score = Number.isFinite(scoreRaw) ? Math.max(0, Math.min(1, scoreRaw)) : 0.5;
     const passedFlag = normalizeSceneFusionBoolean(parsed.passed);
     const productMatched = normalizeSceneFusionBoolean(parsed.productMatched);
+    const productStructurePreserved = normalizeSceneFusionBoolean(
+      parsed.productStructurePreserved ?? parsed.productMatched
+    );
+    const angleAcceptable = normalizeSceneFusionBoolean(parsed.angleAcceptable);
     const targetRemoved = normalizeSceneFusionBoolean(parsed.targetRemoved);
     const scenePreserved = normalizeSceneFusionBoolean(parsed.scenePreserved);
     const suspectedEcho = normalizeSceneFusionBoolean(parsed.suspectedEcho);
@@ -569,6 +571,8 @@ async function reviewSceneFusionResult(params: {
       normalizeSceneFusionHint(parsed.reason, 80) ||
       [
         productMatched === false ? "未识别出参考产品主体" : "",
+        productStructurePreserved === false ? "产品核心结构被改变" : "",
+        angleAcceptable === false ? "产品角度透视不适合场景" : "",
         targetRemoved === false ? "原目标主体仍明显保留" : "",
         scenePreserved === false ? "原场景结构改动过大" : "",
         suspectedEcho === true ? "结果疑似回传产品图" : "",
@@ -580,10 +584,12 @@ async function reviewSceneFusionResult(params: {
     const passed =
       passedFlag === true &&
       productMatched !== false &&
+      productStructurePreserved !== false &&
+      angleAcceptable !== false &&
       targetRemoved !== false &&
       scenePreserved !== false &&
       suspectedEcho !== true &&
-      score >= 0.55;
+      score >= 0.5;
 
     console.log(`[SceneFusion][${params.requestId}] Review result:`, {
       sceneIndex: params.sceneIndex + 1,
@@ -591,6 +597,8 @@ async function reviewSceneFusionResult(params: {
       passed,
       score,
       reason,
+      productStructurePreserved,
+      angleAcceptable,
       reviewModel: model,
     });
 
@@ -1385,15 +1393,15 @@ function buildPrompt(
 
   if (sceneMode === "random-bg") {
     const subject = productName || "产品";
-    prompt = `请以第一张图片中的${subject}为唯一主体，对第二张图片进行背景重绘。要求：1)${subject}外观、材质、颜色与细节保持一致；2)允许轻微调整主体位置与角度以匹配新背景；3)背景需要完整重建并与原图明显不同；4)光影透视自然，输出商业摄影质感。`;
+    prompt = `请以第一张图片中的${subject}为唯一主体，对第二张图片进行背景重绘。要求：1)必须保持${subject}核心结构、轮廓比例、部件数量、材质颜色和主要设计细节与第一张图一致，不要改造成另一款产品；2)允许调整主体位置、大小、角度、朝向和透视以匹配新背景，不要把角度变化当成结构改变；3)背景需要完整重建并与原图明显不同；4)光影透视自然，输出商业摄影质感。`;
   } else {
     const subject = productName || "产品";
     const targetSubject = targetName || "场景主主体";
     const locationHints = [positionHint, replaceCue].filter(Boolean).join("，");
     if (targetName) {
-      prompt = `请参考第一张图片中的${subject}，仅替换第二张图片中的${targetSubject}，不要改成全新场景。要求：1)保持${subject}的整体外观、材质、颜色与结构细节和第一张图一致；2)先移除第二张图中原有的${targetSubject}，再将${subject}放入其原位置；3)调整${subject}的大小、角度、光影和透视，使其与第二张图自然融合；4)结果中不得同时完整保留原${targetSubject}和新的${subject}。`;
+      prompt = `请参考第一张图片中的${subject}，仅替换第二张图片中的${targetSubject}，不要改成全新场景。要求：1)必须保持${subject}核心结构、轮廓比例、部件数量、材质颜色和主要设计细节与第一张图一致，不要增删关键部件或改造成另一款产品；2)先移除第二张图中原有的${targetSubject}，再将${subject}放入其原位置；3)允许调整${subject}的大小、角度、朝向、光影和透视，使其与第二张图自然融合，角度变化本身是允许的；4)结果中不得同时完整保留原${targetSubject}和新的${subject}。`;
     } else {
-      prompt = `请参考第一张图片中的${subject}，将其自然地融合到第二张图片的场景主主体位置。要求：1)保持${subject}的整体外观、颜色、形状和设计风格与第一张图一致；2)优先替换第二张图中最主要的同类主体，不要只做风格微调；3)注意光影和透视关系使融合自然。`;
+      prompt = `请参考第一张图片中的${subject}，将其自然地融合到第二张图片的场景主主体位置。要求：1)必须保持${subject}核心结构、轮廓比例、部件数量、材质颜色和主要设计细节与第一张图一致，不要改造成另一款产品；2)优先替换第二张图中最主要的同类主体，不要只做风格微调；3)允许为了匹配场景调整${subject}角度、朝向、大小和透视，角度变化不代表结构变化；4)注意光影和透视关系使融合自然。`;
     }
     if (locationHints) {
       prompt = `${prompt} 待替换目标定位：${locationHints}。`;
@@ -1870,7 +1878,6 @@ async function processSceneWithDiversity(
 
   for (let attemptIndex = 0; attemptIndex < attemptCandidates.length; attemptIndex += 1) {
     const candidate = attemptCandidates[attemptIndex]!;
-    const attemptStartedAt = Date.now();
     try {
       const normalizedOutputParams = normalizeSceneFusionOutputParamsForCandidate(candidate, {
         aspectRatio: params.aspectRatio,
@@ -1954,18 +1961,6 @@ async function processSceneWithDiversity(
       }
 
       markSceneFusionCandidateHealthy(candidate, params.modelCooldown);
-      await recordAiModelHealthSuccess({
-        model: {
-          id: candidate.model.id,
-          healthStatus: "healthy",
-        },
-      }).catch((healthError) => {
-        console.warn("[SceneFusion] Record model health success failed:", {
-          requestId: params.requestId,
-          model: candidate.model.modelId,
-          error: healthError instanceof Error ? healthError.message : String(healthError),
-        });
-      });
       return {
         result,
         candidate,
@@ -1975,34 +1970,8 @@ async function processSceneWithDiversity(
       const errorMessage = error instanceof Error ? error.message : "未知错误";
       failureReasons.push(`${candidate.model.displayName}: ${errorMessage}`);
       markSceneFusionCandidateFailed(candidate, params.modelCooldown);
-      await recordAiModelHealthFailure({
+      // Batch processing can fail because of per-image inputs, review gates, or echo checks.
-        model: {
+      // Keep these failures local to this request so they do not auto-disable shared models.
-          id: candidate.model.id,
-          modelId: candidate.model.modelId,
-          displayName: candidate.model.displayName,
-          excludeFromFailover: Boolean(candidate.model.excludeFromFailover),
-        },
-        provider: {
-          id: candidate.provider.id,
-          name: candidate.provider.name,
-          type: candidate.provider.type,
-        },
-        error,
-        context: "scene-fusion",
-        elapsedMs: Date.now() - attemptStartedAt,
-        requestId: params.requestId,
-        metadata: {
-          sceneIndex: params.sceneIndex,
-          attempt: attemptIndex + 1,
-          sceneMode: params.sceneMode,
-        },
-      }).catch((healthError) => {
-        console.warn("[SceneFusion] Record model health failure failed:", {
-          requestId: params.requestId,
-          model: candidate.model.modelId,
-          error: healthError instanceof Error ? healthError.message : String(healthError),
-        });
-      });
       console.error("[SceneFusion] Candidate failed, try next:", {
         requestId: params.requestId,
         sceneIndex: params.sceneIndex,

components/agents/AgentDetailReferenceStitchDialog.tsx

@@ -7,6 +7,7 @@ import {
   useRef,
   useState,
   type PointerEvent as ReactPointerEvent,
+  type SyntheticEvent,
 } from "react";
 import { Loader2, Plus, RotateCcw, Scissors, Trash2 } from "lucide-react";
 import { toast } from "sonner";
@@ -19,6 +20,7 @@ import {
   DialogTitle,
 } from "@/components/ui/dialog";
 import { cn } from "@/lib/utils";
+import { buildImageProxyUrl } from "@/lib/image-delivery";
 import type { AgentDetailReplacementReferenceItem } from "@/types/agent";
 
 const MIN_SLICE_HEIGHT = 120;
@@ -27,6 +29,8 @@ type StitchSourceSegment = {
   card: AgentDetailReplacementReferenceItem;
   top: number;
   height: number;
+  sourceWidth?: number;
+  sourceHeight?: number;
 };
 
 type MergedSnapshot = {
@@ -62,6 +66,17 @@ function clamp(value: number, min: number, max: number) {
   return Math.max(min, Math.min(max, value));
 }
 
+function buildStitchPreviewImageUrl(url: string, width: number) {
+  const normalizedUrl = String(url || "").trim();
+  if (!normalizedUrl) return "";
+  return buildImageProxyUrl(normalizedUrl, {
+    width: Math.min(Math.max(Math.round(width || 720), 96), 1200),
+    quality: 84,
+    format: "jpeg",
+    delivery: "proxy",
+  });
+}
+
 interface AgentDetailReferenceStitchDialogProps {
   open: boolean;
   onOpenChange: (open: boolean) => void;
@@ -89,6 +104,7 @@ export function AgentDetailReferenceStitchDialog({
   const [loadingProgressText, setLoadingProgressText] = useState("");
   const [errorText, setErrorText] = useState<string | null>(null);
   const [warningText, setWarningText] = useState<string | null>(null);
+  const [previewImageLoadFailed, setPreviewImageLoadFailed] = useState(false);
   const [passthroughSegmentIndexes, setPassthroughSegmentIndexes] = useState<number[]>([]);
 
   const validCards = useMemo(
@@ -135,6 +151,14 @@ export function AgentDetailReferenceStitchDialog({
     () => new Set(passthroughSegmentIndexes),
     [passthroughSegmentIndexes]
   );
+  const mergedPreviewDisplayUrl = useMemo(
+    () =>
+      snapshot
+        ? buildStitchPreviewImageUrl(snapshot.previewUrl, snapshot.width)
+        : "",
+    [snapshot]
+  );
+  const useVirtualPreview = previewImageLoadFailed || !mergedPreviewDisplayUrl;
 
   useEffect(() => {
     if (!open) {
@@ -143,6 +167,7 @@ export function AgentDetailReferenceStitchDialog({
       setPreviewCutLineY(null);
       setLoadingProgressText("");
       setWarningText(null);
+      setPreviewImageLoadFailed(false);
       setPassthroughSegmentIndexes([]);
       return;
     }
@@ -161,7 +186,8 @@ export function AgentDetailReferenceStitchDialog({
         setIsLoading(true);
         setErrorText(null);
         setWarningText(null);
-        setLoadingProgressText(`正在服务端并行拼合 ${setupCards.length} 张参考图`);
+        setPreviewImageLoadFailed(false);
+        setLoadingProgressText(`正在读取 ${setupCards.length} 张参考图尺寸`);
 
         const response = await fetch("/api/agent-workflow/detail-stitch", {
           method: "POST",
@@ -199,7 +225,7 @@ export function AgentDetailReferenceStitchDialog({
               .filter((value) => Number.isFinite(value) && value > 0 && value < height)
           : [];
 
-        if (!previewUrl || !width || !height || sourceSegments.length === 0) {
+        if (!width || !height || sourceSegments.length === 0) {
           throw new Error("拼合结果无效，请稍后重试");
         }
 
@@ -210,6 +236,7 @@ export function AgentDetailReferenceStitchDialog({
           defaultCutLines,
           sourceSegments,
         });
+        setPreviewImageLoadFailed(!previewUrl);
         setCutLines(defaultCutLines);
         setPassthroughSegmentIndexes([]);
         setWarningText(
@@ -390,6 +417,35 @@ export function AgentDetailReferenceStitchDialog({
     []
   );
 
+  const handleMergedPreviewImageError = useCallback(
+    (event: SyntheticEvent<HTMLImageElement, Event>) => {
+      const image = event.currentTarget;
+      const fallbackUrl = String(snapshot?.previewUrl || "").trim();
+      if (fallbackUrl && image.dataset.originalFallbackApplied !== "1") {
+        image.dataset.originalFallbackApplied = "1";
+        image.src = fallbackUrl;
+        return;
+      }
+      setPreviewImageLoadFailed(true);
+      setWarningText((current) => current || "拼合预览图加载失败，已切换为分段预览。");
+    },
+    [snapshot?.previewUrl]
+  );
+
+  const handleSegmentPreviewImageError = useCallback(
+    (originalUrl: string) => (event: SyntheticEvent<HTMLImageElement, Event>) => {
+      const image = event.currentTarget;
+      const fallbackUrl = String(originalUrl || "").trim();
+      if (fallbackUrl && image.dataset.originalFallbackApplied !== "1") {
+        image.dataset.originalFallbackApplied = "1";
+        image.src = fallbackUrl;
+        return;
+      }
+      image.style.opacity = "0";
+    },
+    []
+  );
+
   const handleApply = useCallback(async () => {
     if (!snapshot) {
       toast.error("当前还没有可用的拼合图");
@@ -546,7 +602,7 @@ export function AgentDetailReferenceStitchDialog({
                   <div className="text-sm text-white/75">
                     {loadingProgressText || "正在拼合参考图..."}
                   </div>
-                  <div className="text-xs text-white/42">会按当前参考图顺序从上到下拼成一张长图</div>
+                  <div className="text-xs text-white/42">会按当前参考图顺序生成虚拟长图，不再上传超长拼合图</div>
                 </div>
               ) : errorText ? (
                 <div className="flex min-h-[420px] flex-col items-center justify-center rounded-[24px] border border-dashed border-red-400/20 bg-red-500/[0.05] px-6 text-center">
@@ -570,15 +626,49 @@ export function AgentDetailReferenceStitchDialog({
                       onPointerLeave={handlePreviewPointerLeave}
                       onClick={handlePreviewClick}
                     >
-                      <img
+                      {useVirtualPreview ? (
-                        src={snapshot.previewUrl}
+                        <div className="w-full bg-white">
-                        alt="拼合长图预览"
+                          {snapshot.sourceSegments.map((segment, index) => {
-                        className="block h-auto w-full select-none"
+                            const segmentImageUrl = String(segment.card.imageUrl || "").trim();
-                        width={snapshot.width}
+                            return (
-                        height={snapshot.height}
+                              <div
-                        draggable={false}
+                                key={`${segment.card.id || "segment"}-${index}-${segment.top}`}
-                        decoding="async"
+                                className="relative overflow-hidden bg-white"
-                      />
+                                style={{
+                                  aspectRatio: `${snapshot.width} / ${Math.max(segment.height, 1)}`,
+                                }}
+                              >
+                                <div className="absolute inset-0 flex items-center justify-center px-4 text-center text-xs text-neutral-400">
+                                  参考图 {index + 1} 加载失败
+                                </div>
+                                {segmentImageUrl ? (
+                                  <img
+                                    src={buildStitchPreviewImageUrl(segmentImageUrl, snapshot.width)}
+                                    alt={`拼合分段预览 ${index + 1}`}
+                                    className="relative z-10 block h-full w-full select-none object-fill"
+                                    draggable={false}
+                                    decoding="async"
+                                    loading={index > 2 ? "lazy" : "eager"}
+                                    onError={handleSegmentPreviewImageError(segmentImageUrl)}
+                                  />
+                                ) : null}
+                              </div>
+                            );
+                          })}
+                        </div>
+                      ) : (
+                        <img
+                          key={mergedPreviewDisplayUrl || snapshot.previewUrl}
+                          src={mergedPreviewDisplayUrl || snapshot.previewUrl}
+                          alt="拼合长图预览"
+                          className="block h-auto w-full select-none"
+                          width={snapshot.width}
+                          height={snapshot.height}
+                          draggable={false}
+                          decoding="async"
+                          onError={handleMergedPreviewImageError}
+                        />
+                      )}
 
                       <div className="pointer-events-none absolute inset-0">
                         {isAddingCutLine && previewCutLineY !== null ? (

lib/ai/runtime/model-health.ts

@@ -1,6 +1,6 @@
 import "server-only";
 
-import { and, desc, eq, inArray, lte, sql } from "drizzle-orm";
+import { and, desc, eq, inArray, sql } from "drizzle-orm";
 import { db } from "@/lib/db";
 import {
   aiModel,
@@ -188,10 +188,25 @@ export async function reviveAiModelsFromCooldown(params?: { modelId?: string })
   const now = new Date();
   const cooldownCutoff = getAutoDisableCooldownCutoff(now);
   const conditions = [
-    eq(aiModel.healthStatus, "auto_disabled"),
     eq(aiModel.isEnabled, false),
     eq(aiModel.excludeFromFailover, false),
-    lte(aiModel.healthAutoDisabledAt, cooldownCutoff),
+    sql`COALESCE(${aiModel.healthAutoDisabledAt}, ${aiModel.healthLastFailureAt}, ${aiModel.healthUpdatedAt}) <= ${cooldownCutoff}`,
+    sql`(
+      ${aiModel.healthStatus} = 'auto_disabled'
+      OR (
+        ${aiModel.healthStatus} = 'degraded'
+        AND ${aiModel.healthLastFailureAt} IS NOT NULL
+        AND ${aiModel.healthConsecutiveFailures} > 0
+        AND ${aiModel.healthLastEventType} IN (
+          'timeout',
+          'quota',
+          'unavailable',
+          'invalid_model',
+          'download_error',
+          'error'
+        )
+      )
+    )`,
   ];
 
   if (params?.modelId) {
@@ -203,6 +218,9 @@ export async function reviveAiModelsFromCooldown(params?: { modelId?: string })
       id: aiModel.id,
       modelId: aiModel.modelId,
       displayName: aiModel.displayName,
+      healthStatus: aiModel.healthStatus,
+      healthAutoDisabledAt: aiModel.healthAutoDisabledAt,
+      healthLastFailureAt: aiModel.healthLastFailureAt,
     })
     .from(aiModel)
     .where(and(...conditions));
@@ -237,6 +255,7 @@ export async function reviveAiModelsFromCooldown(params?: { modelId?: string })
         id: item.id,
         modelId: item.modelId,
         displayName: item.displayName,
+        previousStatus: item.healthStatus,
       })),
     });
   }

lib/db/queries.ts

@@ -4204,6 +4204,17 @@ export async function updateAiModel({
         updateData.healthRecoverySuccessStreak = 0;
         updateData.healthObservationStartedAt = null;
         updateData.healthUpdatedAt = new Date();
+      } else {
+        updateData.healthStatus = "healthy";
+        updateData.healthConsecutiveFailures = 0;
+        updateData.healthLastEventType = null;
+        updateData.healthLastError = null;
+        updateData.healthLastFailureAt = null;
+        updateData.healthAutoDisabledAt = null;
+        updateData.healthAutoDisabledReason = null;
+        updateData.healthRecoverySuccessStreak = 0;
+        updateData.healthObservationStartedAt = null;
+        updateData.healthUpdatedAt = new Date();
       }
     }
     if (isHidden !== undefined) updateData.isHidden = isHidden;

lib/image-delivery.ts

@@ -108,6 +108,7 @@ export function buildImageProxyUrl(url: string, options: ImageProxyOptions = {})
 
   const params = new URLSearchParams();
   params.set("url", source);
+  if (options.delivery === "proxy") params.set("proxy", "1");
   if (width) params.set("w", String(width));
   if (quality) params.set("q", String(quality));
   if (format) params.set("f", format);