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/components/workbench/download-dialog.tsx

@@ -56,7 +56,7 @@ export function DownloadDialog({
           if (r.submitted && r.plan) {
             setRejected(null);
             setDone(r.plan.id);
-            toast.success(`已提交${slotName(r.slotId) ? `(${slotName(r.slotId)})` : ""},进度见“下载与任务”`);
+            toast.success(`已提交${slotName(r.slotId) ? `(${slotName(r.slotId)})` : ""},进度见“下载队列”`);
           } else {
             setRejected(r.rejected);
             toast.warning("没有生成下载计划");
@@ -121,7 +121,7 @@ export function DownloadDialog({
         {done ? (
           <p className="text-caption text-success">
             计划已生成。
-            <Link to="/console/tasks" className="underline underline-offset-4">
+            <Link to="/console/downloads/plans" className="underline underline-offset-4">
               查看
             </Link>
           </p>