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/workbench/toolKeepalive.ts

@@ -0,0 +1,96 @@
+/**
+ * Generic single-task keep-alive for tool pages.
+ * Persists task state to localStorage so in-progress tasks survive page switches.
+ */
+
+const KEEPALIVE_PREFIX = "omniai:tool-task:";
+
+interface ToolTaskKeepalive {
+  taskId: string;
+  resultUrl: string;
+  resultPreview: string;
+  status: string;
+  progress: number;
+  sourceName: string;
+  sourceUrl: string;
+  savedAt: number;
+}
+
+export function saveToolTaskState(key: string, state: {
+  taskId: string;
+  resultUrl?: string;
+  resultPreview?: string;
+  status?: string;
+  progress?: number;
+  sourceName?: string;
+  sourceUrl?: string;
+}): void {
+  if (!state.taskId) return;
+  try {
+    const entry: ToolTaskKeepalive = {
+      taskId: state.taskId,
+      resultUrl: state.resultUrl || "",
+      resultPreview: state.resultPreview || "",
+      status: state.status || "",
+      progress: state.progress || 0,
+      sourceName: state.sourceName || "",
+      sourceUrl: state.sourceUrl || "",
+      savedAt: Date.now(),
+    };
+    window.localStorage.setItem(KEEPALIVE_PREFIX + key, JSON.stringify(entry));
+  } catch { /* quota */ }
+}
+
+export function loadToolTaskState(key: string): ToolTaskKeepalive | null {
+  try {
+    const raw = window.localStorage.getItem(KEEPALIVE_PREFIX + key);
+    if (!raw) return null;
+    const parsed = JSON.parse(raw) as ToolTaskKeepalive;
+    if (Date.now() - (parsed.savedAt || 0) > 2 * 60 * 60 * 1000) {
+      clearToolTaskState(key);
+      return null;
+    }
+    if (!parsed.taskId) return null;
+    return parsed;
+  } catch { return null; }
+}
+
+export function clearToolTaskState(key: string): void {
+  try { window.localStorage.removeItem(KEEPALIVE_PREFIX + key); } catch { /* ignore */ }
+}
+
+const TASK_POLL_INTERVAL = 3000;
+const TASK_POLL_TIMEOUT = 30 * 60 * 1000;
+
+export async function pollTaskUntilDone(
+  taskId: string,
+  onProgress?: (progress: number) => void,
+  abortRef?: { current: boolean },
+): Promise<string | null> {
+  const startTime = Date.now();
+  const { aiGenerationClient } = await import("../../api/aiGenerationClient");
+
+  while (true) {
+    if (abortRef?.current) return null;
+    if (Date.now() - startTime > TASK_POLL_TIMEOUT) return null;
+
+    try {
+      const task = await aiGenerationClient.getTaskStatus(taskId);
+      if (!task) return null;
+
+      const progress = Math.min(99, task.progress || 0);
+      onProgress?.(progress);
+
+      if (task.status === "completed") {
+        return task.resultUrl || null;
+      }
+      if (task.status === "failed" || task.status === "cancelled") {
+        return null;
+      }
+    } catch {
+      // retry on next poll
+    }
+
+    await new Promise((r) => setTimeout(r, TASK_POLL_INTERVAL));
+  }
+}