fix: fast-path prompt-only image analysis

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

@@ -123,6 +123,7 @@ import type {
 } from "@/lib/ai/context-memory/types";
 import { ChatSDKError } from "@/lib/errors";
 import { extractImageUrlsFromText } from "@/lib/image-url";
+import { isExplicitPromptOptimizationRequest } from "@/lib/ai/smart-analyzer";
 import {
   resolveClarificationBypass,
   resolveClarificationMessage,
@@ -3286,8 +3287,37 @@ export async function POST(request: Request) {
       }
     }
 
+    const shouldFastTrackPromptOnly =
+      shouldRunAgentConversation && isExplicitPromptOptimizationRequest(requestTextContent);
+    if (shouldFastTrackPromptOnly) {
+      if (!requestResolvedMediaInput) {
+        requestResolvedMediaInput = resolveChatMediaInput({
+          messageParts: message.parts as any[],
+          historyMessages: [],
+          contextPayload: contextPayload || undefined,
+          requestOrigin,
+          maxImages: 4,
+        });
+      }
+
+      if (!requestTargetResolution) {
+        requestTargetResolution = resolveTargetAssets({
+          text: requestTextContent,
+          mediaInput: requestResolvedMediaInput,
+          contextPayload: contextPayload || undefined,
+          workingState: requestWorkingState || undefined,
+        });
+      }
+
+      smartAutoDetectedIntent = "vision";
+      smartAutoNeedsClarification = false;
+      smartAutoFriendlyMessage =
+        "收到，我先分析这张图并整理可直接使用的提示词，不会直接生图。";
+      console.log("[Smart Auto Mode] ✍️ Fast-path prompt-only request, skip heavy auto-agent workflow");
+    }
+
     // ========== Smart Auto Mode Logic ==========
-    if (shouldRunAgentConversation) {
+    if (shouldRunAgentConversation && !shouldFastTrackPromptOnly) {
       console.log("[Smart Auto Mode] 🚀 Starting intelligent analysis...");
       let autoTextForFallback = "";
       let autoFromHistoryForFallback = false;
@@ -4658,9 +4688,7 @@ export async function POST(request: Request) {
       shouldRunAgentConversation &&
       !smartAutoNeedsClarification &&
       promptOnlySourceImageUrls.length > 0 &&
-      (
-        await import("@/lib/ai/smart-analyzer")
-      ).isExplicitPromptOptimizationRequest(requestTextContent);
+      isExplicitPromptOptimizationRequest(requestTextContent);
 
     if (wantsPromptOnlyFromImageContext) {
       let promptOnlyImageSummary = "";