fix: wrap model data in named objects and fix renderGuardMulti empty check

webui/static/app.js

@@ -93,7 +93,7 @@ modelRegister('nginx', {
     fetch: async () => {
         const r = await apiFetch('/api/proxy/domains');
         if (!r.ok) throw new Error(r.error);
-        return r.data || [];
+        return { domains: r.data || [] };
     },
 });
 
@@ -102,7 +102,7 @@ modelRegister('acme', {
     fetch: async () => {
         const r = await apiFetch('/api/certs/list');
         if (!r.ok) throw new Error(r.error);
-        return r.data || [];
+        return { certs: r.data || [] };
     },
 });