feat(core): add an entry for admin panel (#10813)

![CleanShot 2025-03-13 at 13 02 25@2x](https://github.com/user-attachments/assets/82f50a5b-f079-4c64-a3fa-6554735bea82)

packages/frontend/core/src/modules/cloud/entities/user-feature.ts

@@ -18,6 +18,11 @@ import type { UserFeatureStore } from '../stores/user-feature';
 export class UserFeature extends Entity {
   // undefined means no user, null means loading
   features$ = new LiveData<FeatureType[] | null | undefined>(null);
+
+  isAdmin$ = this.features$.map(features =>
+    features === null ? null : features?.some(f => f === FeatureType.Admin)
+  );
+
   isEarlyAccess$ = this.features$.map(features =>
     features === null
       ? null