enforce admin role by reading user role instead of hardcoding

app/(dashboard)/proxy-hosts/page.tsx

@@ -3,8 +3,10 @@ import { listProxyHosts } from "@/src/lib/models/proxy-hosts";
 import { listCertificates } from "@/src/lib/models/certificates";
 import { listAccessLists } from "@/src/lib/models/access-lists";
 import { getAuthentikSettings } from "@/src/lib/settings";
+import { requireAdmin } from "@/src/lib/auth";
 
 export default async function ProxyHostsPage() {
+  await requireAdmin();
   const [hosts, certificates, accessLists, authentikDefaults] = await Promise.all([
     listProxyHosts(),
     listCertificates(),