feat: 支持托管中转主机和节点接入线路

app/admin/layout.tsx

@@ -7,6 +7,7 @@ const navItems = [
   { href: "/admin/dashboard", label: "仪表盘" },
   { href: "/admin/users", label: "用户管理" },
   { href: "/admin/nodes", label: "节点管理" },
+  { href: "/admin/relays", label: "中转线路" },
   { href: "/admin/certificates", label: "证书与安装" },
   { href: "/admin/subscriptions", label: "订阅配置" },
   { href: "/admin/audits", label: "审计日志" },