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/services/backgroundTaskRunner.ts

@@ -1,4 +1,5 @@
 import { useGenerationStore, type GenerationQueueItem } from "../stores/useGenerationStore";
+import { saveGenerationRecord, type GenerationRecordStatus } from "../api/generationRecordClient";
 import { waitForTask, type TaskProgressEvent } from "../api/taskSubscription";
 import { buildTaskFailureInfo } from "../utils/taskLifecycle";
 
@@ -26,19 +27,55 @@ function getQueueItemModel(item: GenerationQueueItem): string | undefined {
   return typeof item.params?.model === "string" ? item.params.model : undefined;
 }
 
+type TerminalGenerationRecordStatus = Extract<GenerationRecordStatus, GenerationQueueItem["status"]>;
+
+function isTerminalStatus(status: GenerationQueueItem["status"]): status is TerminalGenerationRecordStatus {
+  return status === "completed" || status === "failed" || status === "cancelled";
+}
+
+function persistUnifiedTaskRecord(item: GenerationQueueItem): void {
+  if (!isTerminalStatus(item.status)) return;
+  void saveGenerationRecord({
+    clientRecordId: item.id,
+    tool: item.sourceView,
+    mode: item.type,
+    title: item.title,
+    status: item.status,
+    prompt: item.prompt,
+    taskIds: item.taskId ? [item.taskId] : [],
+    assets: item.resultUrl
+      ? [{
+        role: "result",
+        mediaType: item.type === "video" || item.type === "ecommerce-video" ? "video" : "image",
+        url: item.resultUrl,
+        taskId: item.taskId,
+        scope: `${item.sourceView}/result/${item.type}`,
+      }]
+      : [],
+    config: item.params,
+    result: {
+      resultUrl: item.resultUrl,
+      error: item.error,
+      progress: item.progress,
+    },
+    metadata: {
+      queueCreatedAt: item.createdAt,
+      source: "background-task-runner",
+    },
+    createdAt: new Date(item.createdAt).toISOString(),
+  });
+}
+
 function updateTaskAndNotify(id: string, patch: Partial<GenerationQueueItem>): GenerationQueueItem | null {
   const current = useGenerationStore.getState().queue.find((i) => i.id === id);
   if (!current) return null;
   const next = { ...current, ...patch };
   useGenerationStore.getState().updateTask(id, patch);
+  persistUnifiedTaskRecord(next);
   notifyCallbacks(next);
   return next;
 }
 
-function isTerminalStatus(status: GenerationQueueItem["status"]): boolean {
-  return status === "completed" || status === "failed" || status === "cancelled";
-}
-
 function pollTask(item: GenerationQueueItem): void {
   const key = `poll-${item.id}`;
   if (activePollers.has(key) || !item.taskId) return;