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/core/constants/api_endpoints.dart

@@ -74,4 +74,9 @@ class ApiEndpoints {
   // 검색 및 조회
   static const String lookups = '/lookups';
   static const String categories = '/lookups/categories';
+  
+  // 동적 엔드포인트 생성 메서드
+  static String licenseById(String id) => '/licenses/$id';
+  static String assignLicense(String id) => '/licenses/$id/assign';
+  static String unassignLicense(String id) => '/licenses/$id/unassign';
 }

lib/core/errors/exceptions.dart

@@ -114,4 +114,20 @@ class BusinessException implements Exception {
   
   @override
   String toString() => 'BusinessException: $message (code: $code)';
+}
+
+/// API 관련 예외
+class ApiException implements Exception {
+  final String message;
+  final int? statusCode;
+  final Map<String, dynamic>? errors;
+  
+  ApiException({
+    required this.message,
+    this.statusCode,
+    this.errors,
+  });
+  
+  @override
+  String toString() => 'ApiException: $message (code: $statusCode)';
 }

lib/core/errors/failures.dart

@@ -28,43 +28,43 @@ class ServerFailure extends Failure {
   final Map<String, dynamic>? errors;
   
   const ServerFailure({
-    required String message,
-    String? code,
+    required super.message,
+    super.code,
     this.statusCode,
     this.errors,
-  }) : super(message: message, code: code);
+  });
 }
 
 /// 캐시 실패
 class CacheFailure extends Failure {
   const CacheFailure({
-    required String message,
-    String? code,
-  }) : super(message: message, code: code);
+    required super.message,
+    super.code,
+  });
 }
 
 /// 네트워크 실패
 class NetworkFailure extends Failure {
   const NetworkFailure({
-    required String message,
-    String? code,
-  }) : super(message: message, code: code);
+    required super.message,
+    super.code,
+  });
 }
 
 /// 인증 실패
 class AuthenticationFailure extends Failure {
   const AuthenticationFailure({
-    required String message,
-    String? code,
-  }) : super(message: message, code: code);
+    required super.message,
+    super.code,
+  });
 }
 
 /// 권한 실패
 class AuthorizationFailure extends Failure {
   const AuthorizationFailure({
-    required String message,
-    String? code,
-  }) : super(message: message, code: code);
+    required super.message,
+    super.code,
+  });
 }
 
 /// 유효성 검사 실패
@@ -72,10 +72,10 @@ class ValidationFailure extends Failure {
   final Map<String, List<String>>? fieldErrors;
   
   const ValidationFailure({
-    required String message,
-    String? code,
+    required super.message,
+    super.code,
     this.fieldErrors,
-  }) : super(message: message, code: code);
+  });
 }
 
 /// 리소스 찾을 수 없음 실패
@@ -84,11 +84,11 @@ class NotFoundFailure extends Failure {
   final String? resourceId;
   
   const NotFoundFailure({
-    required String message,
-    String? code,
+    required super.message,
+    super.code,
     this.resourceType,
     this.resourceId,
-  }) : super(message: message, code: code);
+  });
 }
 
 /// 중복 리소스 실패
@@ -97,19 +97,19 @@ class DuplicateFailure extends Failure {
   final String? value;
   
   const DuplicateFailure({
-    required String message,
-    String? code,
+    required super.message,
+    super.code,
     this.field,
     this.value,
-  }) : super(message: message, code: code);
+  });
 }
 
 /// 비즈니스 로직 실패
 class BusinessFailure extends Failure {
   const BusinessFailure({
-    required String message,
-    String? code,
-  }) : super(message: message, code: code);
+    required super.message,
+    super.code,
+  });
 }
 
 /// 타입 정의