번호 자동 부여 대응 및 API 공통 처리 보강

lib/features/dashboard/data/repositories/dashboard_repository_remote.dart

@@ -20,9 +20,6 @@ class DashboardRepositoryRemote implements DashboardRepository {
       _summaryPath,
       options: Options(responseType: ResponseType.json),
     );
-    final json = (response.data?['data'] as Map<String, dynamic>?) ??
-        response.data ??
-        const <String, dynamic>{};
-    return DashboardSummaryDto.fromJson(json).toEntity();
+    return DashboardSummaryDto.fromJson(_api.unwrapAsMap(response)).toEntity();
   }
 }