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/digital-human/DigitalHumanPage.tsx

@@ -21,6 +21,7 @@ import { useCallback, useEffect, useRef, useState } from "react";
 import { aiGenerationClient } from "../../api/aiGenerationClient";
 import { uploadAssetWithProgress } from "../../api/uploadWithProgress";
 import { waitForTask } from "../../api/taskSubscription";
+import { saveToolTaskState, loadToolTaskState, clearToolTaskState } from "../workbench/toolKeepalive";
 import { getServerBaseUrl } from "../../api/serverConnection";
 import type { CreatePreviewTaskInput } from "../../api/webGenerationGateway";
 import StudioToolLayout from "../../components/StudioToolLayout";
@@ -93,6 +94,7 @@ function DigitalHumanPage({
   const cancelRef = useRef(false);
   const activeTaskIdRef = useRef(activeTaskId);
   activeTaskIdRef.current = activeTaskId;
+  const keepaliveRestoredRef = useRef(false);
 
   useEffect(() => {
     return () => {
@@ -106,13 +108,24 @@ function DigitalHumanPage({
     };
   }, [audioPreview]);
 
+  // Keep-alive: restore saved task on mount
+  useEffect(() => {
+    if (keepaliveRestoredRef.current) return;
+    keepaliveRestoredRef.current = true;
+    const saved = loadToolTaskState("digital-human");
+    if (!saved || saved.resultUrl) return;
+    setIsProcessing(true);
+    cancelRef.current = false;
+    pollRunRef.current += 1;
+    setActiveTaskId(saved.taskId);
+    void waitForTaskResult(saved.taskId).catch(() => {});
+    setStatus("正在恢复数字人任务...");
+  }, []);
+
   useEffect(() => {
     return () => {
       pollRunRef.current += 1;
       cancelRef.current = true;
-      if (activeTaskIdRef.current) {
-        aiGenerationClient.cancelTask(activeTaskIdRef.current).catch(() => {});
-      }
     };
   }, []);
 
@@ -186,6 +199,7 @@ function DigitalHumanPage({
     const runId = ++pollRunRef.current;
     setActiveTaskId(taskId);
     setTaskProgress(0);
+    saveToolTaskState("digital-human", { taskId, status: "running", progress: 0 });
     pushDebugEntry("开始订阅", `开始接收任务 ${taskId} 的生成结果。`);
 
     const resultUrl = await waitForTask(taskId, {
@@ -204,6 +218,7 @@ function DigitalHumanPage({
         if (e.status === "completed" && e.resultUrl) {
           setResultVideoUrl(e.resultUrl);
           setNotice(`任务完成，结果已接收：${taskId}`);
+          clearToolTaskState("digital-human");
           pushDebugEntry("结果已接收", summarizeUrl(e.resultUrl), "success", { taskId, resultUrl: e.resultUrl });
         }
       },