feat(server): 添加系统重启功能支持

添加后台任务支持用于处理系统重启请求，实现延迟进程终止机制，
允许系统安全地重启并在重启后自动恢复服务。

feat(frontend): 实现前端系统重启控制面板

在状态页面添加重启对话框组件，提供用户友好的重启确认界面，
包含重启状态监控和错误处理功能，确保用户可以安全重启系统。

docs(deployment): 更新部署指南添加URL协议要求说明

详细说明NANO_AUTHZ_URL和NANO_DEPLOY_URL环境变量必须包含
http://协议前缀的要求，添加常见错误示例和容器重建步骤，
帮助用户避免注册页面502错误问题。

app-instance/frontend/app/(app)/status/page.tsx

@@ -12,17 +12,29 @@ import {
   Key,
   Loader2,
 } from 'lucide-react';
-import { getStatus } from '@/lib/api';
+import { getStatus, restartSystem } from '@/lib/api';
+import {
+  AlertDialog,
+  AlertDialogAction,
+  AlertDialogCancel,
+  AlertDialogContent,
+  AlertDialogDescription,
+  AlertDialogFooter,
+  AlertDialogHeader,
+  AlertDialogTitle,
+} from '@/components/ui/alert-dialog';
 import { Button } from '@/components/ui/button';
 import { Card, CardContent, CardHeader, CardTitle } from '@/components/ui/card';
 import { Badge } from '@/components/ui/badge';
-import { Separator } from '@/components/ui/separator';
 import type { SystemStatus } from '@/types';
 
 export default function StatusPage() {
   const [status, setStatus] = useState<SystemStatus | null>(null);
   const [error, setError] = useState<string | null>(null);
   const [loading, setLoading] = useState(true);
+  const [restartDialogOpen, setRestartDialogOpen] = useState(false);
+  const [restarting, setRestarting] = useState(false);
+  const [restartError, setRestartError] = useState<string | null>(null);
 
   const loadStatus = async () => {
     setLoading(true);
@@ -41,6 +53,36 @@ export default function StatusPage() {
     loadStatus();
   }, []);
 
+  useEffect(() => {
+    if (!restarting) {
+      return;
+    }
+
+    const intervalId = window.setInterval(async () => {
+      try {
+        await getStatus();
+        window.location.reload();
+      } catch {
+        // Ignore failures until the container is back.
+      }
+    }, 3000);
+
+    return () => {
+      window.clearInterval(intervalId);
+    };
+  }, [restarting]);
+
+  const handleRestart = async () => {
+    setRestartError(null);
+    try {
+      await restartSystem();
+      setRestartDialogOpen(false);
+      setRestarting(true);
+    } catch (err: any) {
+      setRestartError(err.message || '重启失败');
+    }
+  };
+
   if (loading) {
     return (
       <div className="flex items-center justify-center py-20">
@@ -80,7 +122,7 @@ export default function StatusPage() {
     <div className="max-w-4xl mx-auto p-6 space-y-6">
       <div className="flex items-center justify-between">
         <h1 className="text-2xl font-bold">系统状态</h1>
-        <Button onClick={loadStatus} variant="outline" size="sm">
+        <Button onClick={loadStatus} variant="outline" size="sm" disabled={restarting}>
           <RefreshCw className="w-4 h-4 mr-2" />
           刷新
         </Button>
@@ -94,17 +136,48 @@ export default function StatusPage() {
             系统信息
           </CardTitle>
         </CardHeader>
-        <CardContent className="space-y-3">
-          <InfoRow
-            label="配置"
-            value={status.config_path}
-            ok={status.config_exists}
-          />
-          <InfoRow
-            label="工作区"
-            value={status.workspace}
-            ok={status.workspace_exists}
-          />
+        <CardContent>
+          <div className="flex flex-col gap-4 sm:flex-row sm:items-center sm:justify-between">
+            <div className="space-y-1">
+              <p className="text-sm font-medium">重启当前实例</p>
+              <p className="text-sm text-muted-foreground">
+                {restarting
+                  ? '正在重启当前 docker，服务恢复后页面会自动刷新。'
+                  : '会重启当前 docker 容器。重启完成后需要重新登录。'}
+              </p>
+              {restartError ? (
+                <p className="text-sm text-destructive">{restartError}</p>
+              ) : null}
+            </div>
+            <AlertDialog open={restartDialogOpen} onOpenChange={setRestartDialogOpen}>
+              <Button
+                variant="destructive"
+                onClick={() => setRestartDialogOpen(true)}
+                disabled={restarting}
+              >
+                {restarting ? (
+                  <Loader2 className="w-4 h-4 mr-2 animate-spin" />
+                ) : (
+                  <RefreshCw className="w-4 h-4 mr-2" />
+                )}
+                Restart
+              </Button>
+              <AlertDialogContent>
+                <AlertDialogHeader>
+                  <AlertDialogTitle>确认重启当前实例？</AlertDialogTitle>
+                  <AlertDialogDescription>
+                    这会重启当前 docker 容器，页面会短暂不可用。由于当前登录态保存在内存里，重启完成后需要重新登录。
+                  </AlertDialogDescription>
+                </AlertDialogHeader>
+                <AlertDialogFooter>
+                  <AlertDialogCancel disabled={restarting}>取消</AlertDialogCancel>
+                  <AlertDialogAction onClick={handleRestart} disabled={restarting}>
+                    {restarting ? '重启中...' : '确认 Restart'}
+                  </AlertDialogAction>
+                </AlertDialogFooter>
+              </AlertDialogContent>
+            </AlertDialog>
+          </div>
         </CardContent>
       </Card>