refactor(user): clean up comments and rename variables

frontend/src/app/service/user.service.ts

@@ -43,8 +43,6 @@ export class UserService {
   }
 
   public getOrCreateUser(profile: Record<string, unknown>): Observable<User> {
-    // Authentik format might differ from Keycloak
-    // Check different possible locations for the ID and username
     const info = profile['info'] as Record<string, unknown> | undefined;
     const id = (info?.['sub'] as string) || (profile['sub'] as string);
     const username =