feat: add mobile shadcn admin navigation

frontend/src/components/app/AppTopbar.tsx

@@ -1,16 +1,29 @@
-import { Bell, ChevronRight, LogOut, UserRound } from 'lucide-react'
+import { Bell, ChevronRight, LogOut, Menu, UserRound } from 'lucide-react'
 
 import { Badge } from '@/components/ui/badge'
 import { Button } from '@/components/ui/button'
 import { Separator } from '@/components/ui/separator'
 import { useAuth } from '@/features/auth/AuthProvider'
 
-export function AppTopbar() {
+type AppTopbarProps = {
+  onMobileMenuClick?: () => void
+}
+
+export function AppTopbar({ onMobileMenuClick }: AppTopbarProps) {
   const { logout, user } = useAuth()
 
   return (
     <header className="sticky top-0 z-20 flex h-14 items-center justify-between border-b border-border bg-surface/95 px-6 backdrop-blur">
       <div className="flex min-w-0 items-center gap-2 text-sm">
+        <Button
+          variant="ghost"
+          size="icon"
+          className="-ml-2 lg:hidden"
+          aria-label="打开导航"
+          onClick={onMobileMenuClick}
+        >
+          <Menu data-icon="inline-start" />
+        </Button>
         <span className="font-medium text-foreground">AI 工单平台</span>
         <ChevronRight className="size-4 text-muted-foreground" />
         <span className="truncate text-muted-foreground">当前工作区</span>