fix: 电商视频生成链路稳定性 — AI超时/重试/断点续传 + 404页面 + DashScope Key移除

- adVideoPlanClient: 模型级联降级(qwen-max→plus→turbo), 5xx/网络错误可重试, 超时延长至180s, 错误信息包含上游响应体
- 服务端ai/chat: 超时60s→120s, AbortError返回504(非500), PM2已热重载
- EcommerceVideoWorkspace: 策划失败后支持从断点继续(保留已完成步骤的中间产物), 分镜图/视频生成仅重做失败场景
- scriptEvalClient: 移除客户端DASHSCOPE_API_KEY引用(Nginx代理注入)
- NotFoundPage: 未知路由显示404页面(替代兜底跳首页)

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

src/App.tsx

@@ -33,6 +33,7 @@ import {
 import { webGenerationGateway, type CreatePreviewTaskInput } from "./api/webGenerationGateway";
 import { translateTaskError } from "./utils/translateTaskError";
 import AppShell from "./components/AppShell";
+const NotFoundPage = lazy(() => import("./components/NotFoundPage"));
 import { cloneWorkflow, createBlankWorkflow } from "./data/workflows";
 const AgentPage = lazy(() => import("./features/agent/AgentPage"));
 const AssetsPage = lazy(() => import("./features/assets/AssetsPage"));
@@ -115,9 +116,10 @@ const VIEW_KEYS = new Set<WebViewKey>([
   "communityCaseAdd",
   "report",
   "providerHealth",
+  "not-found",
 ]);
 
-const PUBLIC_VIEW_SET = new Set<WebViewKey>(["home", "login", "community", "more"]);
+const PUBLIC_VIEW_SET = new Set<WebViewKey>(["home", "login", "community", "more", "not-found"]);
 
 function normalizeViewKey(rawView: string): WebViewKey {
   const normalized =
@@ -130,7 +132,7 @@ function normalizeViewKey(rawView: string): WebViewKey {
           : rawView === "community-case-add"
             ? "communityCaseAdd"
         : rawView;
-  return VIEW_KEYS.has(normalized as WebViewKey) ? (normalized as WebViewKey) : "home";
+  return VIEW_KEYS.has(normalized as WebViewKey) ? (normalized as WebViewKey) : "not-found";
 }
 
 function readViewFromHash(): WebViewKey {
@@ -146,7 +148,8 @@ function isWorkspaceView(view: WebViewKey): boolean {
     view !== "ecommerceHub" &&
     view !== "ecommerce" &&
     view !== "scriptTokens" &&
-    view !== "login"
+    view !== "login" &&
+    view !== "not-found"
   );
 }
 
@@ -1178,7 +1181,6 @@ function App() {
           />
         );
       case "home":
-      default:
         return (
           <HomePage
             onOpenGenerate={() => handleSetView("workbench")}
@@ -1190,6 +1192,9 @@ function App() {
             onOpenImageTool={handleOpenImageWorkbenchTool}
           />
         );
+      case "not-found":
+      default:
+        return <NotFoundPage onGoHome={() => handleSetView("home")} />;
     }
   })();