feat(frontend): 승인 템플릿 API 통합 및 디버그 로그인 확장

- docs 폴더 문서를 최신 API 계약으로 갱신하고 가이드를 다듬었다\n- approvals data/presentation 레이어를 API v4 스펙에 맞춰 리팩터링했다\n- approver 자동완성 위젯을 신규 공유 레포지토리에 맞춰 교체하고 UX를 보강했다\n- inventory/rental 페이지 테이블 초기화 시 승인 기준 연동을 정비했다\n- 로그인 페이지 디버그 버튼을 tera/exa 계정으로 분리해 QA 로그인을 단순화했다\n- get_it 등록과 테스트 케이스를 신규 공유 리포지토리에 맞춰 업데이트했다

test/features/approvals/template/presentation/pages/approval_template_page_test.dart

@@ -12,6 +12,11 @@ import 'package:superport_v2/features/approvals/domain/repositories/approval_tem
 import 'package:superport_v2/features/approvals/domain/usecases/apply_approval_template_use_case.dart';
 import 'package:superport_v2/features/approvals/domain/usecases/save_approval_template_use_case.dart';
 import 'package:superport_v2/features/approvals/template/presentation/pages/approval_template_page.dart';
+import 'package:superport_v2/features/approvals/shared/domain/entities/approval_approver_candidate.dart';
+import 'package:superport_v2/features/approvals/shared/domain/repositories/approval_approver_repository.dart';
+import 'package:superport_v2/features/auth/application/auth_service.dart';
+import 'package:superport_v2/features/auth/domain/entities/auth_session.dart';
+import 'package:superport_v2/features/auth/domain/entities/authenticated_user.dart';
 
 class _MockApprovalTemplateRepository extends Mock
     implements ApprovalTemplateRepository {}
@@ -23,6 +28,8 @@ class _FakeTemplateInput extends Fake implements ApprovalTemplateInput {}
 class _FakeTemplateStepInput extends Fake
     implements ApprovalTemplateStepInput {}
 
+class _MockAuthService extends Mock implements AuthService {}
+
 Widget _buildApp(Widget child) {
   return MaterialApp(
     home: ShadTheme(
@@ -82,6 +89,37 @@ void main() {
           approvalRepository: approvalRepository,
         ),
       );
+      GetIt.I.registerLazySingleton<ApprovalApproverRepository>(
+        () => _FakeApproverRepository({
+          33: ApprovalApproverCandidate(
+            id: 33,
+            employeeNo: 'EMP033',
+            name: '테스트 승인자',
+            team: 'QA팀',
+          ),
+          21: ApprovalApproverCandidate(
+            id: 21,
+            employeeNo: 'E001',
+            name: '최승인',
+            team: '결재팀',
+          ),
+        }),
+      );
+      final authService = _MockAuthService();
+      when(() => authService.session).thenReturn(
+        AuthSession(
+          accessToken: 'test-access',
+          refreshToken: 'test-refresh',
+          expiresAt: DateTime(2099, 1, 1),
+          user: const AuthenticatedUser(
+            id: 99,
+            name: '테스트 사용자',
+            employeeNo: 'E999',
+            email: 'test@example.com',
+          ),
+        ),
+      );
+      GetIt.I.registerSingleton<AuthService>(authService);
     });
 
     ApprovalTemplate buildTemplate({bool isActive = true}) {
@@ -333,3 +371,38 @@ void main() {
     });
   });
 }
+
+class _FakeApproverRepository implements ApprovalApproverRepository {
+  _FakeApproverRepository(this._candidates);
+
+  final Map<int, ApprovalApproverCandidate> _candidates;
+
+  @override
+  Future<ApprovalApproverCandidate?> fetchById(int id) async {
+    return _candidates[id];
+  }
+
+  @override
+  Future<List<ApprovalApproverCandidate>> search({
+    required String keyword,
+    int limit = 20,
+  }) async {
+    final lower = keyword.trim().toLowerCase();
+    if (lower.isEmpty) {
+      return _candidates.values.toList(growable: false);
+    }
+    return _candidates.values
+        .where(
+          (candidate) =>
+              candidate.name.toLowerCase().contains(lower) ||
+              candidate.employeeNo.toLowerCase().contains(lower) ||
+              candidate.id.toString().contains(lower),
+        )
+        .toList(growable: false);
+  }
+
+  @override
+  Future<List<ApprovalApproverCandidate>> listInitial({int limit = 20}) async {
+    return _candidates.values.take(limit).toList(growable: false);
+  }
+}