refactor: Repository 패턴 적용 및 Clean Architecture 완성

## 주요 변경사항

### 🏗️ Architecture
- Repository 패턴 전면 도입 (인터페이스/구현체 분리)
- Domain Layer에 Repository 인터페이스 정의
- Data Layer에 Repository 구현체 배치
- UseCase 의존성을 Service에서 Repository로 전환

### 📦 Dependency Injection
- GetIt 기반 DI Container 재구성 (lib/injection_container.dart)
- Repository 인터페이스와 구현체 등록
- Service와 Repository 공존 (마이그레이션 기간)

### 🔄 Migration Status
완료:
- License 모듈 (6개 UseCase)
- Warehouse Location 모듈 (5개 UseCase)

진행중:
- Auth 모듈 (2/5 UseCase)
- Company 모듈 (1/6 UseCase)

대기:
- User 모듈 (7개 UseCase)
- Equipment 모듈 (4개 UseCase)

### 🎯 Controller 통합
- 중복 Controller 제거 (with_usecase 버전)
- 단일 Controller로 통합
- UseCase 패턴 직접 적용

### 🧹 코드 정리
- 임시 파일 제거 (test_*.md, task.md)
- Node.js 아티팩트 제거 (package.json)
- 불필요한 테스트 파일 정리

### ✅ 테스트 개선
- Real API 중심 테스트 구조
- Mock 제거, 실제 API 엔드포인트 사용
- 통합 테스트 프레임워크 강화

## 기술적 영향
- 의존성 역전 원칙 적용
- 레이어 간 결합도 감소
- 테스트 용이성 향상
- 확장성 및 유지보수성 개선

## 다음 단계
1. User/Equipment 모듈 Repository 마이그레이션
2. Service Layer 점진적 제거
3. 캐싱 전략 구현
4. 성능 최적화

lib/data/models/user/user_dto.g.dart

@@ -10,13 +10,18 @@ _$UserDtoImpl _$$UserDtoImplFromJson(Map<String, dynamic> json) =>
     _$UserDtoImpl(
       id: (json['id'] as num).toInt(),
       username: json['username'] as String,
-      email: json['email'] as String,
       name: json['name'] as String,
+      email: json['email'] as String?,
       phone: json['phone'] as String?,
       role: json['role'] as String,
       companyId: (json['company_id'] as num?)?.toInt(),
+      companyName: json['company_name'] as String?,
       branchId: (json['branch_id'] as num?)?.toInt(),
+      branchName: json['branch_name'] as String?,
       isActive: json['is_active'] as bool,
+      lastLoginAt: json['last_login_at'] == null
+          ? null
+          : DateTime.parse(json['last_login_at'] as String),
       createdAt: DateTime.parse(json['created_at'] as String),
       updatedAt: DateTime.parse(json['updated_at'] as String),
     );
@@ -25,13 +30,16 @@ Map<String, dynamic> _$$UserDtoImplToJson(_$UserDtoImpl instance) =>
     <String, dynamic>{
       'id': instance.id,
       'username': instance.username,
-      'email': instance.email,
       'name': instance.name,
+      'email': instance.email,
       'phone': instance.phone,
       'role': instance.role,
       'company_id': instance.companyId,
+      'company_name': instance.companyName,
       'branch_id': instance.branchId,
+      'branch_name': instance.branchName,
       'is_active': instance.isActive,
+      'last_login_at': instance.lastLoginAt?.toIso8601String(),
       'created_at': instance.createdAt.toIso8601String(),
       'updated_at': instance.updatedAt.toIso8601String(),
     };
@@ -40,7 +48,7 @@ _$CreateUserRequestImpl _$$CreateUserRequestImplFromJson(
         Map<String, dynamic> json) =>
     _$CreateUserRequestImpl(
       username: json['username'] as String,
-      email: json['email'] as String,
+      email: json['email'] as String?,
       password: json['password'] as String,
       name: json['name'] as String,
       phone: json['phone'] as String?,
@@ -72,6 +80,7 @@ _$UpdateUserRequestImpl _$$UpdateUserRequestImplFromJson(
       role: json['role'] as String?,
       companyId: (json['company_id'] as num?)?.toInt(),
       branchId: (json['branch_id'] as num?)?.toInt(),
+      isActive: json['is_active'] as bool?,
     );
 
 Map<String, dynamic> _$$UpdateUserRequestImplToJson(
@@ -84,6 +93,7 @@ Map<String, dynamic> _$$UpdateUserRequestImplToJson(
       'role': instance.role,
       'company_id': instance.companyId,
       'branch_id': instance.branchId,
+      'is_active': instance.isActive,
     };
 
 _$ChangeStatusRequestImpl _$$ChangeStatusRequestImplFromJson(
@@ -131,3 +141,25 @@ Map<String, dynamic> _$$UserListDtoImplToJson(_$UserListDtoImpl instance) =>
       'per_page': instance.perPage,
       'total_pages': instance.totalPages,
     };
+
+_$UserDetailDtoImpl _$$UserDetailDtoImplFromJson(Map<String, dynamic> json) =>
+    _$UserDetailDtoImpl(
+      user: UserDto.fromJson(json['user'] as Map<String, dynamic>),
+    );
+
+Map<String, dynamic> _$$UserDetailDtoImplToJson(_$UserDetailDtoImpl instance) =>
+    <String, dynamic>{
+      'user': instance.user,
+    };
+
+_$UserResponseImpl _$$UserResponseImplFromJson(Map<String, dynamic> json) =>
+    _$UserResponseImpl(
+      user: UserDto.fromJson(json['user'] as Map<String, dynamic>),
+      message: json['message'] as String?,
+    );
+
+Map<String, dynamic> _$$UserResponseImplToJson(_$UserResponseImpl instance) =>
+    <String, dynamic>{
+      'user': instance.user,
+      'message': instance.message,
+    };