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/console/engine.$runId.tsx

@@ -17,7 +17,7 @@ import { errorMessage } from "~/lib/api.ts";
 import { engineRunLabel, formatDuration, formatRelative, spanSec as runDurationSec } from "~/lib/labels.ts";
 import { formatDateTime } from "~/lib/utils.ts";
 
-export const meta = () => [{ title: "运行详情 · 工作流引擎" }];
+export const meta = () => [{ title: "运行详情 · 引擎面板" }];
 
 const KIND_LABEL: Record<string, string> = {
   function: "函数",