결재 API 계약 보완 및 테스트 정리

lib/features/approvals/data/repositories/approval_repository_remote.dart

@@ -139,7 +139,7 @@ class ApprovalRepositoryRemote implements ApprovalRepository {
 
   /// 새로운 결재를 생성한다.
   @override
-  Future<Approval> create(ApprovalInput input) async {
+  Future<Approval> create(ApprovalCreateInput input) async {
     final response = await _api.post<Map<String, dynamic>>(
       _basePath,
       data: input.toPayload(),
@@ -151,9 +151,9 @@ class ApprovalRepositoryRemote implements ApprovalRepository {
 
   /// 결재 기본 정보를 수정한다.
   @override
-  Future<Approval> update(int id, ApprovalInput input) async {
+  Future<Approval> update(ApprovalUpdateInput input) async {
     final response = await _api.patch<Map<String, dynamic>>(
-      '$_basePath/$id',
+      '$_basePath/${input.id}',
       data: input.toPayload(),
       options: Options(responseType: ResponseType.json),
     );