fix: cap detail-plan latency and add LLM timeouts

app/api/canvas/detail-plan/route.ts

@@ -14,6 +14,11 @@ import { inlineVisionImages } from "@/lib/ai/vision-inline";
 
 export const runtime = "nodejs";
 export const maxDuration = 180;
+const DETAIL_PLAN_INLINE_MAX_IMAGES = 4;
+const DETAIL_PLAN_INLINE_TIMEOUT_MS = 4000;
+const DETAIL_PLAN_INLINE_RETRIES = 1;
+const DETAIL_PLAN_MAIN_TIMEOUT_MS = 55000;
+const DETAIL_PLAN_PREFLIGHT_TIMEOUT_MS = 35000;
 
 function isAbortError(error: unknown): boolean {
   const target = error as {
@@ -56,6 +61,19 @@ function isVolcanoResponsesPlanner(config: {
   return baseUrl.includes("ark.cn-beijing.volces.com") || /\/api\/v3(\/responses)?\/?$/.test(baseUrl);
 }
 
+async function generateTextWithTimeout(params: any, timeoutMs: number) {
+  const controller = new AbortController();
+  const timer = setTimeout(() => controller.abort(), timeoutMs);
+  try {
+    return await generateText({
+      ...params,
+      abortSignal: controller.signal,
+    } as any);
+  } finally {
+    clearTimeout(timer);
+  }
+}
+
 type DetailPlanRequest = {
   prompt?: string;
   count?: number;
@@ -1465,7 +1483,7 @@ async function runDualDirectorPlanPreflight(params: {
             briefText,
           ];
 
-    const { text } = await generateText({
+    const { text } = await generateTextWithTimeout({
       model: params.model,
       messages: [
         {
@@ -1479,7 +1497,7 @@ async function runDualDirectorPlanPreflight(params: {
           : "你同时扮演高转化电商详情页的平面设计总监与营销总监。仅输出JSON。",
       temperature: 0.1,
       maxTokens: 2000,
-    } as any);
+    }, DETAIL_PLAN_PREFLIGHT_TIMEOUT_MS);
 
     const parsed = extractJsonBlock<{
       pass?: unknown;
@@ -1661,10 +1679,10 @@ export async function POST(request: Request) {
           .map((url) => ({ type: "image" as const, image: url }));
       } else {
         const inlined = await inlineVisionImages(referenceImages, {
-          maxImages: 6,
+          maxImages: DETAIL_PLAN_INLINE_MAX_IMAGES,
           maxSide: 900,
-          timeoutMs: 12000,
-          retries: 2,
+          timeoutMs: DETAIL_PLAN_INLINE_TIMEOUT_MS,
+          retries: DETAIL_PLAN_INLINE_RETRIES,
           loggerPrefix: "[Canvas Detail Plan]",
         });
         imageInputs = inlined.inlineDataUrls.map((dataUrl) => ({
@@ -1676,7 +1694,7 @@ export async function POST(request: Request) {
 
     let text = "";
     try {
-      const result = await generateText({
+      const result = await generateTextWithTimeout({
         model,
         messages: [
           {
@@ -1727,7 +1745,7 @@ export async function POST(request: Request) {
           `{"summary":"简述","globalStyle":{"designLanguage":"一句话风格方向","typography":{"fontFamily":"字体家族","title":"主标题规范","subtitle":"副标题规范","body":"正文规范"},"layout":{"grid":"栅格","safeArea":"安全区","rhythm":"留白节奏"},"palette":"配色规范"},"screens":[{"index":1,"screenType":"B","objective":"本屏目标","title":"首屏示例：甩甩杆，自拍不手抖（6-20字）","subtitle":"一句副标题","copy":"正文文案","layoutNote":"排版说明","useModel":false,"modelReason":"是否需要人物及原因","bundleShowcase":false,"bundleReason":"是否为搭配展示页及原因","fabe":{"b":"利益","f":"特征","a":"优势","e":"证据"},"visualPrompt":"用于生图的完整提示词，必须包含790x1300与统一字体排版"}]}`,
         temperature: 0.25,
         maxTokens: 1800,
-      } as any);
+      }, DETAIL_PLAN_MAIN_TIMEOUT_MS);
       text = String(result?.text || "");
     } catch (error) {
       const message = String((error as Error)?.message || "");