feat: API 연동 개선 및 라이선스 모델 확장

- 라이선스 모델 전면 개편 (상세 필드 추가, 계산 필드 구현)
- API 응답 처리 개선 (HTTP 상태 코드 기반)
- 장비 출고 폼 컨트롤러 추가
- 회사 지점 정보 모델 추가
- 공통 데이터 모델 구조 추가
- 전체 서비스 레이어 API 호출 방식 통일
- UI 컴포넌트 마이너 개선

lib/screens/user/controllers/user_list_controller.dart

@@ -4,8 +4,6 @@ import 'package:superport/models/user_model.dart';
 import 'package:superport/models/company_model.dart';
 import 'package:superport/services/mock_data_service.dart';
 import 'package:superport/services/user_service.dart';
-import 'package:superport/utils/constants.dart';
-import 'package:superport/utils/user_utils.dart';
 
 /// 담당자 목록 화면의 상태 및 비즈니스 로직을 담당하는 컨트롤러
 class UserListController extends ChangeNotifier {

lib/screens/user/user_form.dart

@@ -1,15 +1,11 @@
 import 'package:flutter/material.dart';
 import 'package:provider/provider.dart';
-import 'package:superport/models/company_model.dart';
-import 'package:superport/models/user_model.dart';
 import 'package:superport/screens/common/theme_tailwind.dart';
-import 'package:superport/screens/common/custom_widgets.dart';
 import 'package:superport/services/mock_data_service.dart';
 import 'package:superport/utils/constants.dart';
 import 'package:superport/utils/validators.dart';
 import 'package:flutter/services.dart';
 import 'package:superport/screens/user/controllers/user_form_controller.dart';
-import 'package:superport/models/user_phone_field.dart';
 import 'package:superport/screens/common/widgets/company_branch_dropdown.dart';
 
 // 사용자 등록/수정 화면 (UI만 담당, 상태/로직 분리)

lib/screens/user/user_list.dart

@@ -1,6 +1,4 @@
 import 'package:flutter/material.dart';
-import 'package:superport/models/company_model.dart';
-import 'package:superport/models/user_model.dart';
 import 'package:superport/screens/common/theme_tailwind.dart';
 import 'package:superport/screens/common/main_layout.dart';
 import 'package:superport/screens/common/custom_widgets.dart';
@@ -82,6 +80,11 @@ class _UserListScreenState extends State<UserListScreen> {
                 onPressed: () {
                   _controller.deleteUser(id, () {
                     Navigator.pop(context);
+                  }, (error) {
+                    Navigator.pop(context);
+                    ScaffoldMessenger.of(context).showSnackBar(
+                      SnackBar(content: Text(error)),
+                    );
                   });
                 },
                 child: const Text('삭제'),

lib/screens/user/user_list_redesign.dart

@@ -211,7 +211,7 @@ class _UserListRedesignState extends State<UserListRedesign> {
                   const SizedBox(height: 16),
                   Text(
                     '데이터를 불러올 수 없습니다',
-                    style: ShadcnTheme.h4,
+                    style: ShadcnTheme.headingH4,
                   ),
                   const SizedBox(height: 8),
                   Text(
@@ -291,7 +291,7 @@ class _UserListRedesignState extends State<UserListRedesign> {
                                           : null,
                                 );
                               },
-                              variant: ShadcnButtonVariant.outline,
+                              variant: ShadcnButtonVariant.secondary,
                               icon: const Icon(Icons.filter_list),
                             ),
                             const SizedBox(width: ShadcnTheme.spacing2),
@@ -302,7 +302,7 @@ class _UserListRedesignState extends State<UserListRedesign> {
                                     ? '모든 권한'
                                     : getRoleName(controller.filterRole!),
                                 onPressed: null,
-                                variant: ShadcnButtonVariant.outline,
+                                variant: ShadcnButtonVariant.secondary,
                                 icon: const Icon(Icons.person),
                               ),
                               onSelected: (role) {