add admin interface, angular migration

src/app/ui/main/main.component.ts

@@ -158,6 +158,13 @@ export class MainComponent {
     }
   }
 
+  hasAdminRole(): boolean {
+    if (this.auth && this.auth.authorities) {
+      return this.auth.authorities.some((auth: any) => auth.authority === 'ROLE_ADMIN');
+    }
+    return false;
+  }
+
   openExternal(url, target = '_self') {
     window.open(url, target);
   }