fix: 全站页面保活机制、登录拦截优化、UI修复与功能完善

- 移除未登录全页面拦截，改为浏览自由 + 功能使用时弹窗
- 修复PageTransition退出动画卡死导致黑屏的bug
- CanvasPage添加加载中状态避免首次访问黑屏假死
- 全站7个工具页添加页面保活机制，切页后台任务不中断
- 修复未登录时401误触发"用户已在别处登录"弹窗
- 删除MorePage模板板块、微信登录、EcommerceTemplates/SizeTemplate路由
- 剧本评分接入DashScope qwen3.7-max直连API
- 电商视频生成重构为3阶段可视管线（策划→生成图片→生成视频）
- 电商视频保活增强：异步函数直接写localStorage避免卸载丢失
- Workbench侧边栏移除mode过滤，三模式共用同一对话列表
- 首页更新轮播图/背景视频、按钮跳转修正、文案优化
- AppShell顶栏新增网站备案信息按钮
- 多个页面的terminate/cancel按钮覆盖、单镜头重试、批量保存下载

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

src/features/character-mix/CharacterMixPage.tsx

@@ -22,6 +22,7 @@ import type { WebImageWorkbenchTool, WebViewKey } from "../../types";
 import { aiGenerationClient } from "../../api/aiGenerationClient";
 import { uploadAssetWithProgress } from "../../api/uploadWithProgress";
 import { waitForTask } from "../../api/taskSubscription";
+import { saveToolTaskState, loadToolTaskState, clearToolTaskState } from "../workbench/toolKeepalive";
 import { addToolResultToAssetLibrary, saveToolResultToLocal } from "../workbench/toolResultActions";
 import { CheckCircleOutlined, InfoCircleOutlined } from "@ant-design/icons";
 
@@ -85,12 +86,32 @@ function CharacterMixPage({
     };
   }, [checkImage, characterPreview]);
 
+  const keepaliveRestoredRef = useRef(false);
+
+  // Keep-alive: restore saved task on mount
+  useEffect(() => {
+    if (keepaliveRestoredRef.current) return;
+    keepaliveRestoredRef.current = true;
+    const saved = loadToolTaskState("charactermix");
+    if (!saved || saved.resultUrl) return;
+    setIsCreating(true);
+    abortRef.current = false;
+    void pollTaskUntilDone(saved.taskId).then((result) => {
+      setResultUrl(result);
+      setNotice(result ? "角色迁移完成" : "已取消");
+      setIsCreating(false);
+      setProgress(0);
+      if (result) {
+        saveToolTaskState("charactermix", { taskId: saved.taskId, resultUrl: result, status: "完成", progress: 100 });
+      } else {
+        clearToolTaskState("charactermix");
+      }
+    });
+  }, []);
+
   useEffect(() => {
     return () => {
       abortRef.current = true;
-      if (taskIdRef.current) {
-        aiGenerationClient.cancelTask(taskIdRef.current).catch(() => {});
-      }
     };
   }, []);
 
@@ -100,6 +121,7 @@ function CharacterMixPage({
       aiGenerationClient.cancelTask(taskIdRef.current).catch(() => {});
       taskIdRef.current = null;
     }
+    clearToolTaskState("charactermix");
   }, []);
 
   const pollTaskUntilDone = useCallback(async (taskId: string): Promise<string | null> => {
@@ -153,10 +175,16 @@ function CharacterMixPage({
         muted: !watermark,
       });
       taskIdRef.current = taskId;
+      saveToolTaskState("charactermix", { taskId, status: "running", progress: 0 });
 
       const result = await pollTaskUntilDone(taskId);
       setResultUrl(result);
       setNotice(result ? "角色迁移完成" : "已取消");
+      if (result) {
+        saveToolTaskState("charactermix", { taskId, resultUrl: result, status: "完成", progress: 100 });
+      } else {
+        clearToolTaskState("charactermix");
+      }
     } catch (error) {
       setNotice(error instanceof Error ? error.message : "任务创建失败，请稍后重试。");
     } finally {