feat(web): regroup console nav into 7 groups, split downloads/plans/tasks, add legacy redirects

- Sidebar: 概览/资源/订阅/下载/整理/Agent/系统, 18 items (+ 定时任务); single
  active item via findNavItem; 待处理 badge; collapsed rail groups; mobile drawer
  shares NAV_GROUPS.
- New pages: /downloads (queue + cache watermark header), /downloads/plans,
  /downloads/:id, /tasks (business tasks only) + /tasks/:id detail, /rules.
- Legacy links: ?tab= on tasks/subscriptions/sources redirect via clientLoader;
  /tasks/:downloadId falls back to /downloads/:id.
- List filters in URL query; settingsPath() helper for settings deep links.
- Copy per glossary (待处理, 收录策略, 引擎面板, 文件管理, 版本目标).

Co-Authored-By: Claude Opus 5.5 <[email protected]>

apps/web/app/routes.ts

@@ -22,6 +22,10 @@ export default [
       route("sites", "routes/console/sites.tsx"),
       route("sites/:siteId", "routes/console/sites.$siteId.tsx"),
       route("sources", "routes/console/sources.tsx"),
+      route("rules", "routes/console/rules.tsx"),
+      route("downloads", "routes/console/downloads.tsx"),
+      route("downloads/plans", "routes/console/downloads.plans.tsx"),
+      route("downloads/:id", "routes/console/downloads.$id.tsx"),
       route("tasks", "routes/console/tasks.tsx"),
       route("tasks/:id", "routes/console/tasks.$id.tsx"),
       route("agent", "routes/console/agent.tsx"),