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/home.tsx

@@ -230,7 +230,7 @@ function CurrentWork({ w }: { w: Dashboard["currentWork"] }) {
   ];
   const idle = counts.every((c) => c.v === 0) && w.items.length === 0 && w.agentRuns.length === 0;
   return (
-    <Section title="当前工作" icon={Activity} to={consolePath("tasks")}>
+    <Section title="当前工作" icon={Activity} to={consolePath("downloads")}>
       <div className="mb-2 flex flex-wrap gap-x-4 gap-y-1 text-meta text-muted-foreground">
         {counts.map((c) => (
           <span key={c.label}>
@@ -246,7 +246,10 @@ function CurrentWork({ w }: { w: Dashboard["currentWork"] }) {
             const s = downloadLabel(it.status);
             return (
               <Row key={it.downloadTaskId}>
-                <Link to={consolePath("tasks", it.downloadTaskId)} className="min-w-0 flex-1 truncate hover:underline">
+                <Link
+                  to={consolePath("downloads", it.downloadTaskId)}
+                  className="min-w-0 flex-1 truncate hover:underline"
+                >
                   {it.name}
                 </Link>
                 <span className="shrink-0 text-meta text-muted-foreground tabular-nums">
@@ -300,7 +303,7 @@ function NeedsAttention({ n }: { n: Dashboard["needsAttention"] }) {
 
 function CacheSection({ c }: { c: Dashboard["cache"] }) {
   return (
-    <Section title="缓存与保留" icon={HardDrive} to={consolePath("settings")}>
+    <Section title="缓存水位" icon={HardDrive} to={consolePath("downloads")}>
       {c.volumes.length === 0 ? (
         <EmptyState
           plain
@@ -402,7 +405,7 @@ function SourcesSection({ s }: { s: Dashboard["sources"] }) {
           plain
           icon={Radio}
           title="还没有来源"
-          description="在系统设置或来源页登记站点、Feed 与实例。"
+          description="在站点工作台登记站点,在来源健康新建 Feed。"
           className="py-6"
         />
       ) : (