fix(app): close feature association gaps

web/src/App.tsx

@@ -182,7 +182,7 @@ export default function App() {
           />
           <Route
             path="api-configs"
-            element={<Navigate to="/admin" replace />}
+            element={<Navigate to="/admin?tab=api" replace />}
           />
           <Route
             path="tasks"

web/src/components/Layout.tsx

@@ -310,24 +310,28 @@ export function Layout() {
             </Link>
 
             {/* Quick Discover shortcut button */}
-            <Link 
-              to="/discover" 
-              className="hidden md:flex items-center gap-2 rounded-xl border border-gray-200 px-4 py-2.5 text-xs font-bold text-gray-500 hover:bg-gray-50 hover:text-gray-900 transition-all"
-            >
-              <Sparkles size={14} className="text-brand-500" />
-              <span>发现新片</span>
-            </Link>
+            {can('can_view_discover') && (
+              <Link
+                to="/discover"
+                className="hidden md:flex items-center gap-2 rounded-xl border border-gray-200 px-4 py-2.5 text-xs font-bold text-gray-500 hover:bg-gray-50 hover:text-gray-900 transition-all"
+              >
+                <Sparkles size={14} className="text-brand-500" />
+                <span>发现新片</span>
+              </Link>
+            )}
 
             {/* Notification alert bubble */}
-            <Link
-              to="/notify-channels"
-              title="通知配置"
-              aria-label="打开通知配置"
-              className="relative rounded-xl border border-gray-200 p-2.5 text-gray-500 hover:bg-gray-100 hover:text-gray-900 transition-all"
-            >
-              <Bell size={18} />
-              <span className="absolute top-1.5 right-1.5 h-2 w-2 rounded-full bg-brand-500 ring-2 ring-white animate-pulse" />
-            </Link>
+            {isAdmin && (
+              <Link
+                to="/notify-channels"
+                title="通知配置"
+                aria-label="打开通知配置"
+                className="relative rounded-xl border border-gray-200 p-2.5 text-gray-500 hover:bg-gray-100 hover:text-gray-900 transition-all"
+              >
+                <Bell size={18} />
+                <span className="absolute top-1.5 right-1.5 h-2 w-2 rounded-full bg-brand-500 ring-2 ring-white animate-pulse" />
+              </Link>
+            )}
 
             {/* Horizontal divider lines */}
             <span className="h-6 w-px bg-gray-200" />

web/src/pages/AIAssistantPage.tsx

@@ -324,7 +324,7 @@ export function AIAssistantPage() {
       {!status?.enabled && (
         <p className="text-xs text-sand-500">
           提示: 当前未配置外部 AI Provider,系统将使用本地规则引擎解析查询。
-          管理员可在 <Link to="/api-configs" className="text-brand-500">API 配置</Link>{' '}
+          管理员可在 <Link to="/admin?tab=api" className="text-brand-500">API 配置</Link>{' '}
           中接入 OpenAI / DeepSeek 等服务以获得更好效果。
         </p>
       )}

web/src/pages/AdminPage.tsx

@@ -1,4 +1,5 @@
 import { FormEvent, useEffect, useState } from 'react'
+import { useSearchParams } from 'react-router-dom'
 import toast from 'react-hot-toast'
 import { KeyRound, Pencil, Plus, ShieldCheck, Trash2, UserCheck, UserX, X } from 'lucide-react'
 
@@ -11,13 +12,31 @@ import { ManagementShortcuts } from '../components/ManagementShortcuts'
 import { confirmAction } from '../components/ConfirmDialog'
 import { requestPassword } from '../components/PasswordDialog'
 
+type AdminTab = 'library' | 'users' | 'api'
+
+function parseAdminTab(value: string | null): AdminTab {
+  if (value === 'users' || value === 'api') return value
+  return 'library'
+}
+
 export function AdminPage() {
-  const [tab, setTab] = useState<'library' | 'users' | 'api'>('library')
+  const [searchParams, setSearchParams] = useSearchParams()
+  const [tab, setTab] = useState<AdminTab>(() => parseAdminTab(searchParams.get('tab')))
   const tabs = [
     { key: 'library' as const, label: '媒体库' },
     { key: 'users' as const, label: '用户' },
     { key: 'api' as const, label: '外部API' },
   ]
+
+  useEffect(() => {
+    setTab(parseAdminTab(searchParams.get('tab')))
+  }, [searchParams])
+
+  const selectTab = (next: AdminTab) => {
+    setTab(next)
+    setSearchParams(next === 'library' ? {} : { tab: next })
+  }
+
   return (
     <div className="space-y-6">
       <h1 className="font-display text-3xl font-bold text-ink-600">管理后台</h1>
@@ -35,7 +54,7 @@ export function AdminPage() {
         {tabs.map((k) => (
           <button
             key={k.key}
-            onClick={() => setTab(k.key)}
+            onClick={() => selectTab(k.key)}
             className={
               'border-b-2 px-4 py-2 text-sm transition ' +
               (tab === k.key

web/src/pages/DownloadsPage.tsx

@@ -1,4 +1,5 @@
 import { FormEvent, useEffect, useState } from 'react'
+import { Link } from 'react-router-dom'
 import toast from 'react-hot-toast'
 import { ArrowDown, ArrowUp, Download, Film, HardDrive, Rss, ShieldCheck, Trash2 } from 'lucide-react'
 
@@ -280,11 +281,18 @@ export function DownloadsPage() {
         </div>
         {torrents === null && (
           <div className="glass-panel text-sand-500">
-            尚未连接到下载器 — 请到{' '}
-            <a href="/download-clients" className="text-brand-500 hover:underline">
-              下载器
-            </a>{' '}
-            页面添加并测试连接。
+            尚未连接到下载器 —{' '}
+            {role === 'admin' ? (
+              <>
+                请到{' '}
+                <Link to="/download-clients" className="text-brand-500 hover:underline">
+                  下载器
+                </Link>{' '}
+                页面添加并测试连接。
+              </>
+            ) : (
+              '请联系管理员添加并测试下载器连接。'
+            )}
           </div>
         )}
         {torrents && torrents.length === 0 && (