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

lib/features/approvals/request/presentation/widgets/approval_step_configurator.dart

@@ -4,7 +4,7 @@ import 'package:shadcn_ui/shadcn_ui.dart';
 
 import '../../../../../widgets/components/feedback.dart';
 import '../../../../../widgets/components/superport_dialog.dart';
-import '../../../shared/approver_catalog.dart';
+import '../../../shared/domain/entities/approval_approver_candidate.dart';
 import '../../../shared/widgets/approver_autocomplete_field.dart';
 import '../controllers/approval_request_controller.dart';
 import 'approval_step_row.dart';
@@ -435,7 +435,7 @@ class _ConfiguratorDialogBodyState extends State<_ConfiguratorDialogBody> {
   }
 
   Future<void> _openAddStepDialog() async {
-    ApprovalApproverCatalogItem? selected;
+    ApprovalApproverCandidate? selected;
     final idController = TextEditingController();
 
     final result = await SuperportDialog.show<bool>(
@@ -483,13 +483,19 @@ class _ConfiguratorDialogBodyState extends State<_ConfiguratorDialogBody> {
       return;
     }
 
-    final participant = _resolveParticipant(selected, idController.text.trim());
-    if (participant == null) {
+    final selection = selected;
+    if (selection == null) {
       SuperportToast.warning(context, '유효한 승인자를 선택해주세요.');
       idController.dispose();
       return;
     }
 
+    final participant = ApprovalRequestParticipant(
+      id: selection.id,
+      name: selection.name,
+      employeeNo: selection.employeeNo,
+    );
+
     final added = widget.controller.addStep(approver: participant);
     if (!added) {
       final message = widget.controller.errorMessage ?? '결재 단계를 추가하지 못했습니다.';
@@ -503,31 +509,6 @@ class _ConfiguratorDialogBodyState extends State<_ConfiguratorDialogBody> {
     idController.dispose();
   }
 
-  ApprovalRequestParticipant? _resolveParticipant(
-    ApprovalApproverCatalogItem? selected,
-    String manualInput,
-  ) {
-    if (selected != null) {
-      return ApprovalRequestParticipant(
-        id: selected.id,
-        name: selected.name,
-        employeeNo: selected.employeeNo,
-      );
-    }
-    final manualId = int.tryParse(manualInput);
-    if (manualId == null) {
-      return null;
-    }
-    final match = ApprovalApproverCatalog.byId(manualId);
-    if (match == null) {
-      return null;
-    }
-    return ApprovalRequestParticipant(
-      id: match.id,
-      name: match.name,
-      employeeNo: match.employeeNo,
-    );
-  }
 }
 
 class _InfoBadge extends StatelessWidget {

lib/features/approvals/request/presentation/widgets/approval_step_row.dart

@@ -3,7 +3,7 @@ import 'package:lucide_icons_flutter/lucide_icons.dart' as lucide;
 import 'package:shadcn_ui/shadcn_ui.dart';
 
 import '../../../../../widgets/components/feedback.dart';
-import '../../../shared/approver_catalog.dart';
+import '../../../shared/domain/entities/approval_approver_candidate.dart';
 import '../../../shared/widgets/approver_autocomplete_field.dart';
 import '../controllers/approval_request_controller.dart';
 
@@ -96,37 +96,23 @@ class _ApprovalStepRowState extends State<ApprovalStepRow> {
 
   Future<void> _handleApproverSelected(
     BuildContext context,
-    ApprovalApproverCatalogItem? item,
+    ApprovalApproverCandidate? candidate,
   ) async {
     if (widget.readOnly) {
       return;
     }
     ApprovalRequestParticipant? nextParticipant;
 
-    if (item != null) {
+    if (candidate != null) {
       nextParticipant = ApprovalRequestParticipant(
-        id: item.id,
-        name: item.name,
-        employeeNo: item.employeeNo,
+        id: candidate.id,
+        name: candidate.name,
+        employeeNo: candidate.employeeNo,
       );
     } else {
-      final manualId = int.tryParse(_approverIdController.text.trim());
-      if (manualId == null) {
-        SuperportToast.warning(context, '승인자를 다시 선택해주세요.');
-        _restorePreviousApprover();
-        return;
-      }
-      final catalogMatch = ApprovalApproverCatalog.byId(manualId);
-      if (catalogMatch == null) {
-        SuperportToast.warning(context, '등록되지 않은 승인자입니다.');
-        _restorePreviousApprover();
-        return;
-      }
-      nextParticipant = ApprovalRequestParticipant(
-        id: catalogMatch.id,
-        name: catalogMatch.name,
-        employeeNo: catalogMatch.employeeNo,
-      );
+      SuperportToast.warning(context, '승인자를 다시 선택해주세요.');
+      _restorePreviousApprover();
+      return;
     }
 
     final updated = widget.controller.updateStep(