feat(pagination): 공통 컨트롤 도입과 사용자 관리 가이드 추가

- 테이블 푸터에서 SuperportPaginationControls를 사용하도록 각 관리 페이지 페이지네이션 로직을 정리

- SuperportPaginationControls 위젯을 추가하고 SuperportTable 푸터를 개선해 페이지 사이즈 선택과 이동 버튼을 분리

- 사용자 등록·계정 관리 요구사항을 문서화한 doc/user_setting.md를 작성하고 AGENTS.md 코멘트 규칙을 업데이트

- flutter analyze를 수행해 빌드 경고가 없음을 확인

lib/features/approvals/presentation/pages/approval_page.dart

@@ -13,6 +13,7 @@ import '../../../../widgets/components/feedback.dart';
 import '../../../../widgets/components/filter_bar.dart';
 import '../../../../widgets/components/superport_dialog.dart';
 import '../../../../widgets/components/superport_table.dart';
+import '../../../../widgets/components/superport_pagination_controls.dart';
 import '../../../../widgets/components/feature_disabled_placeholder.dart';
 import '../../domain/entities/approval.dart';
 import '../../domain/entities/approval_template.dart';
@@ -212,9 +213,6 @@ class _ApprovalEnabledPageState extends State<_ApprovalEnabledPage> {
         final totalPages = result == null || result.pageSize == 0
             ? 1
             : (result.total / result.pageSize).ceil().clamp(1, 9999);
-        final hasNext = result == null
-            ? false
-            : (result.page * result.pageSize) < result.total;
         final isLoadingActions = _controller.isLoadingActions;
         final isPerformingAction = _controller.isPerformingAction;
         final processingStepId = _controller.processingStepId;
@@ -349,44 +347,11 @@ class _ApprovalEnabledPageState extends State<_ApprovalEnabledPage> {
                       '페이지 $currentPage / $totalPages',
                       style: theme.textTheme.small,
                     ),
-                    Row(
-                      children: [
-                        ShadButton.outline(
-                          size: ShadButtonSize.sm,
-                          onPressed:
-                              _controller.isLoadingList || currentPage <= 1
-                              ? null
-                              : () => _controller.fetch(page: 1),
-                          child: const Text('처음'),
-                        ),
-                        const SizedBox(width: 8),
-                        ShadButton.outline(
-                          size: ShadButtonSize.sm,
-                          onPressed:
-                              _controller.isLoadingList || currentPage <= 1
-                              ? null
-                              : () => _controller.fetch(page: currentPage - 1),
-                          child: const Text('이전'),
-                        ),
-                        const SizedBox(width: 8),
-                        ShadButton.outline(
-                          size: ShadButtonSize.sm,
-                          onPressed: _controller.isLoadingList || !hasNext
-                              ? null
-                              : () => _controller.fetch(page: currentPage + 1),
-                          child: const Text('다음'),
-                        ),
-                        const SizedBox(width: 8),
-                        ShadButton.outline(
-                          size: ShadButtonSize.sm,
-                          onPressed:
-                              _controller.isLoadingList ||
-                                  currentPage >= totalPages
-                              ? null
-                              : () => _controller.fetch(page: totalPages),
-                          child: const Text('마지막'),
-                        ),
-                      ],
+                    SuperportPaginationControls(
+                      currentPage: currentPage,
+                      totalPages: totalPages,
+                      isBusy: _controller.isLoadingList,
+                      onPageSelected: (page) => _controller.fetch(page: page),
                     ),
                   ],
                 ),