결재 템플릿 단계 적용 구현

- ApprovalTemplate 엔티티·DTO·원격 리포지토리 추가
- ApprovalController에 템플릿 로딩/적용 상태와 assignSteps 호출 연동
- ApprovalPage 단계 탭에 템플릿 선택 UI 및 적용 확인 다이얼로그 구현
- 템플릿 적용 단위 테스트와 IMPLEMENTATION_TASKS 현황 갱신

lib/features/masters/group/data/repositories/group_repository_remote.dart

@@ -18,6 +18,7 @@ class GroupRepositoryRemote implements GroupRepository {
     int page = 1,
     int pageSize = 20,
     String? query,
+    bool? isDefault,
     bool? isActive,
   }) async {
     final response = await _api.get<Map<String, dynamic>>(
@@ -26,10 +27,48 @@ class GroupRepositoryRemote implements GroupRepository {
         'page': page,
         'page_size': pageSize,
         if (query != null && query.isNotEmpty) 'q': query,
+        if (isDefault != null) 'is_default': isDefault,
         if (isActive != null) 'is_active': isActive,
       },
       options: Options(responseType: ResponseType.json),
     );
     return GroupDto.parsePaginated(response.data ?? const {});
   }
+
+  @override
+  Future<Group> create(GroupInput input) async {
+    final response = await _api.post<Map<String, dynamic>>(
+      _basePath,
+      data: input.toPayload(),
+      options: Options(responseType: ResponseType.json),
+    );
+    final data = (response.data?['data'] as Map<String, dynamic>?) ?? {};
+    return GroupDto.fromJson(data).toEntity();
+  }
+
+  @override
+  Future<Group> update(int id, GroupInput input) async {
+    final response = await _api.patch<Map<String, dynamic>>(
+      '$_basePath/$id',
+      data: input.toPayload(),
+      options: Options(responseType: ResponseType.json),
+    );
+    final data = (response.data?['data'] as Map<String, dynamic>?) ?? {};
+    return GroupDto.fromJson(data).toEntity();
+  }
+
+  @override
+  Future<void> delete(int id) async {
+    await _api.delete<void>('$_basePath/$id');
+  }
+
+  @override
+  Future<Group> restore(int id) async {
+    final response = await _api.post<Map<String, dynamic>>(
+      '$_basePath/$id/restore',
+      options: Options(responseType: ResponseType.json),
+    );
+    final data = (response.data?['data'] as Map<String, dynamic>?) ?? {};
+    return GroupDto.fromJson(data).toEntity();
+  }
 }