승인 단계 삭제 복구 흐름 구현하고 API 정렬 문서 추가

lib/features/approvals/step/data/repositories/approval_step_repository_remote.dart

@@ -82,4 +82,24 @@ class ApprovalStepRepositoryRemote implements ApprovalStepRepository {
         (raw is Map<String, dynamic> ? raw : const <String, dynamic>{});
     return ApprovalStepRecordDto.fromJson(data).toEntity();
   }
+
+  /// 결재 단계를 비활성화한다.
+  @override
+  Future<void> delete(int id) async {
+    await _api.delete<void>('$_basePath/$id');
+  }
+
+  /// 비활성화된 결재 단계를 복구한다.
+  @override
+  Future<ApprovalStepRecord> restore(int id) async {
+    final response = await _api.post<Map<String, dynamic>>(
+      '$_basePath/$id/restore',
+      options: Options(responseType: ResponseType.json),
+    );
+    final raw = response.data;
+    final data =
+        (raw?['data'] as Map<String, dynamic>?) ??
+        (raw is Map<String, dynamic> ? raw : const <String, dynamic>{});
+    return ApprovalStepRecordDto.fromJson(data).toEntity();
+  }
 }