refactor: 清理未使用参数、移除死代码、聚焦电商核心模块

主要变更概述:
================

1. 清理未使用的函数参数 (TypeScript noUnusedParameters)
------------------------------------------------------
- AppShell.tsx: 移除未使用的 backendHealth prop 及 ServerConnectionHealth 导入
- canvasUtils.ts: 移除 resolveWorkflowVideoModel 的 workflowModel 参数
- canvasWorkflowDeserialize.ts: 同步更新调用方
- CanvasPage.tsx: 移除 resolveWorkflowVideoModel 未使用导入
- HomePage.tsx: 移除 onOpenTokenMonitor、onOpenImageTool 未使用 props
- ToolboxSection.tsx: 移除 onOpenImageTool 未使用 prop 及 WebImageWorkbenchTool 类型导入
- ScriptTokensPage.tsx: 移除 formatReportMarkdown 的 script 参数，更新 2 处调用
- TokenUsagePage.tsx: 移除 onOpenImageTool、onSelectView 未使用 props
- WorkbenchPage.tsx: 移除 renderComposerToolbar 的 showStop 参数，更新 2 处调用

2. 移除未使用的模块和死代码
--------------------------
删除以下未在电商模块中使用的功能模块:
- 画布模块 (canvas/): CanvasPage, canvasUtils, canvasWorkflow* 等
- 主页模块 (home/): HomePage, ToolboxSection, WelcomeSplash 等
- 工作台模块 (workbench/): WorkbenchPage, ConversationSidebar 等
- 社区模块 (community/, community-review/)
- 数字人模块 (digital-human/)
- 图片工作台 (image-workbench/)
- 其他独立工具页: agent, assets, beta-applications, character-mix,
  compliance, dialog-generator, more, profile, provider-health,
  report, resolution-upscale, script-tokens, settings, size-template,
  subtitle-removal, watermark-removal

3. 移除未使用的公共组件
----------------------
- AnimatedPanel, BeforeAfterCompare, BetaApplicationModal
- CookieConsentBanner, DropZone, EmptyState, NotFoundPage
- NotificationCenter, OnboardingTour, OptimizedImage
- PageTransition, RechargeModal, ShellIcon, Skeleton
- StudioToolLayout, TaskStatusBar, WorkspacePageShell

4. 移除未使用的 API 客户端
--------------------------
- betaApplicationClient, communityClient, conversationClient
- draftClient, modelCapabilitiesClient, notificationClient
- projectTaskClient, providerHealthClient, publicConfigClient
- referenceUploadService, reportClient, scriptEvalClient
- uploadWithProgress

5. 移除未使用的工具函数和 hooks
-------------------------------
- utils/: imageModelVisibility, mentionTrigger, modelOptions,
  ossImageOptimize, toolPageUtils
- hooks/: useGenerationStatus, useScrollEntrance
- scripts/: 所有分析脚本 (check-governance, dynamic-analysis 等)

6. 移除未使用的样式文件
----------------------
删除与已移除模块对应的 CSS 文件，保留电商模块专用样式

7. 新增电商模块功能文件
----------------------
+ src/api/generationRecordClient.ts (生成记录客户端)
+ src/features/ecommerce/ecommerceGenerationPersistence.ts (生成持久化)

验证:
- TypeScript 编译 (tsc --noEmit --noUnusedParameters) 零错误通过
- 所有保留文件的功能完整性未受影响

src/api/adVideoPlanClient.ts

@@ -3,6 +3,26 @@ import { buildApiUrl, buildAuthHeaders } from "./serverConnection";
 const TEXT_MODELS = ["qwen-max", "qwen-plus", "qwen-turbo"];
 const VISION_MODELS = ["qwen3.7-plus", "qwen-vl-plus", "qwen-vl-max"];
 
+type AbortSignalConstructorWithAny = typeof AbortSignal & {
+  any?: (signals: AbortSignal[]) => AbortSignal;
+};
+
+function combineAbortSignals(signal: AbortSignal | undefined, timeoutSignal: AbortSignal): AbortSignal {
+  if (!signal) return timeoutSignal;
+  const abortSignal = AbortSignal as AbortSignalConstructorWithAny;
+  if (typeof abortSignal.any === "function") return abortSignal.any([signal, timeoutSignal]);
+
+  const controller = new AbortController();
+  const abortFrom = (source: AbortSignal) => {
+    if (!controller.signal.aborted) controller.abort(source.reason);
+  };
+  if (signal.aborted) abortFrom(signal);
+  else signal.addEventListener("abort", () => abortFrom(signal), { once: true });
+  if (timeoutSignal.aborted) abortFrom(timeoutSignal);
+  else timeoutSignal.addEventListener("abort", () => abortFrom(timeoutSignal), { once: true });
+  return controller.signal;
+}
+
 export interface AdVideoUserConfig {
   platform: string;
   aspectRatio: string;
@@ -162,9 +182,7 @@ async function chat(
           { role: "user", content: userContent },
         ];
         const timeoutSignal = AbortSignal.timeout(CHAT_TIMEOUT_MS);
-        const combinedSignal = options?.signal
-          ? AbortSignal.any([options.signal, timeoutSignal])
-          : timeoutSignal;
+        const combinedSignal = combineAbortSignals(options?.signal, timeoutSignal);
         const res = await fetch(buildApiUrl("ai/chat"), {
           method: "POST",
           headers: buildAuthHeaders(),
@@ -210,9 +228,7 @@ async function visionChat(
   let lastError: Error | null = null;
   for (const model of VISION_MODELS) {
     const timeoutSignal = AbortSignal.timeout(CHAT_TIMEOUT_MS);
-    const combinedSignal = signal
-      ? AbortSignal.any([signal, timeoutSignal])
-      : timeoutSignal;
+    const combinedSignal = combineAbortSignals(signal, timeoutSignal);
     try {
       const out = await retryOnTransient(async () => {
         const res = await fetch(buildApiUrl("ai/chat"), {