feat: 장비 관리 API 연동 구현

- Equipment 관련 DTO 모델 생성 (Request/Response/List/History/In/Out/IO)
- EquipmentRemoteDataSource 구현 (10개 API 엔드포인트)
- EquipmentService 비즈니스 로직 구현
- Controller를 ChangeNotifier 패턴으로 개선
- 장비 목록 화면에 Provider 패턴 및 무한 스크롤 적용
- 장비 입고 화면 API 연동 및 비동기 처리
- DI 컨테이너에 Equipment 관련 의존성 등록
- API/Mock 데이터 소스 전환 가능 (Feature Flag)
- API 통합 진행 상황 문서 업데이트

lib/data/models/equipment/equipment_history_dto.g.dart

@@ -0,0 +1,61 @@
+// GENERATED CODE - DO NOT MODIFY BY HAND
+
+part of 'equipment_history_dto.dart';
+
+// **************************************************************************
+// JsonSerializableGenerator
+// **************************************************************************
+
+_$EquipmentHistoryDtoImpl _$$EquipmentHistoryDtoImplFromJson(
+        Map<String, dynamic> json) =>
+    _$EquipmentHistoryDtoImpl(
+      id: (json['id'] as num).toInt(),
+      equipmentId: (json['equipmentId'] as num).toInt(),
+      transactionType: json['transactionType'] as String,
+      quantity: (json['quantity'] as num).toInt(),
+      transactionDate: DateTime.parse(json['transactionDate'] as String),
+      remarks: json['remarks'] as String?,
+      createdBy: (json['createdBy'] as num?)?.toInt(),
+      userId: (json['userId'] as num?)?.toInt(),
+      createdAt: DateTime.parse(json['createdAt'] as String),
+      userName: json['userName'] as String?,
+      performedBy: json['performedBy'] as String?,
+    );
+
+Map<String, dynamic> _$$EquipmentHistoryDtoImplToJson(
+        _$EquipmentHistoryDtoImpl instance) =>
+    <String, dynamic>{
+      'id': instance.id,
+      'equipmentId': instance.equipmentId,
+      'transactionType': instance.transactionType,
+      'quantity': instance.quantity,
+      'transactionDate': instance.transactionDate.toIso8601String(),
+      'remarks': instance.remarks,
+      'createdBy': instance.createdBy,
+      'userId': instance.userId,
+      'createdAt': instance.createdAt.toIso8601String(),
+      'userName': instance.userName,
+      'performedBy': instance.performedBy,
+    };
+
+_$CreateHistoryRequestImpl _$$CreateHistoryRequestImplFromJson(
+        Map<String, dynamic> json) =>
+    _$CreateHistoryRequestImpl(
+      transactionType: json['transactionType'] as String,
+      quantity: (json['quantity'] as num).toInt(),
+      transactionDate: json['transactionDate'] == null
+          ? null
+          : DateTime.parse(json['transactionDate'] as String),
+      remarks: json['remarks'] as String?,
+      userId: (json['userId'] as num?)?.toInt(),
+    );
+
+Map<String, dynamic> _$$CreateHistoryRequestImplToJson(
+        _$CreateHistoryRequestImpl instance) =>
+    <String, dynamic>{
+      'transactionType': instance.transactionType,
+      'quantity': instance.quantity,
+      'transactionDate': instance.transactionDate?.toIso8601String(),
+      'remarks': instance.remarks,
+      'userId': instance.userId,
+    };