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_io_response.g.dart

@@ -0,0 +1,31 @@
+// GENERATED CODE - DO NOT MODIFY BY HAND
+
+part of 'equipment_io_response.dart';
+
+// **************************************************************************
+// JsonSerializableGenerator
+// **************************************************************************
+
+_$EquipmentIoResponseImpl _$$EquipmentIoResponseImplFromJson(
+        Map<String, dynamic> json) =>
+    _$EquipmentIoResponseImpl(
+      success: json['success'] as bool,
+      message: json['message'] as String,
+      transactionId: (json['transactionId'] as num).toInt(),
+      equipmentId: (json['equipmentId'] as num).toInt(),
+      quantity: (json['quantity'] as num).toInt(),
+      transactionType: json['transactionType'] as String,
+      transactionDate: DateTime.parse(json['transactionDate'] as String),
+    );
+
+Map<String, dynamic> _$$EquipmentIoResponseImplToJson(
+        _$EquipmentIoResponseImpl instance) =>
+    <String, dynamic>{
+      'success': instance.success,
+      'message': instance.message,
+      'transactionId': instance.transactionId,
+      'equipmentId': instance.equipmentId,
+      'quantity': instance.quantity,
+      'transactionType': instance.transactionType,
+      'transactionDate': instance.transactionDate.toIso8601String(),
+    };