backup: 사용하지 않는 파일 삭제 전 복구 지점

- 전체 371개 파일 중 82개 미사용 파일 식별
- Phase 1: 33개 파일 삭제 예정 (100% 안전)
- Phase 2: 30개 파일 삭제 검토 예정
- Phase 3: 19개 파일 수동 검토 예정

🤖 Generated with Claude Code

Co-Authored-By: Claude <noreply@anthropic.com>

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

@@ -54,13 +54,11 @@ Map<String, dynamic> _$$EquipmentDtoImplToJson(_$EquipmentDtoImpl instance) =>
 _$EquipmentRequestDtoImpl _$$EquipmentRequestDtoImplFromJson(
         Map<String, dynamic> json) =>
     _$EquipmentRequestDtoImpl(
-      companiesId: (json['companies_id'] as num).toInt(),
-      modelsId: (json['models_id'] as num).toInt(),
+      companiesId: (json['companies_id'] as num?)?.toInt(),
+      modelsId: (json['models_id'] as num?)?.toInt(),
       serialNumber: json['serial_number'] as String,
       barcode: json['barcode'] as String?,
-      purchasedAt: json['purchased_at'] == null
-          ? null
-          : DateTime.parse(json['purchased_at'] as String),
+      purchasedAt: DateTime.parse(json['purchased_at'] as String),
       purchasePrice: (json['purchase_price'] as num?)?.toInt() ?? 0,
       warrantyNumber: json['warranty_number'] as String,
       warrantyStartedAt: DateTime.parse(json['warranty_started_at'] as String),
@@ -75,7 +73,7 @@ Map<String, dynamic> _$$EquipmentRequestDtoImplToJson(
       'models_id': instance.modelsId,
       'serial_number': instance.serialNumber,
       'barcode': instance.barcode,
-      'purchased_at': instance.purchasedAt?.toIso8601String(),
+      'purchased_at': instance.purchasedAt.toIso8601String(),
       'purchase_price': instance.purchasePrice,
       'warranty_number': instance.warrantyNumber,
       'warranty_started_at': instance.warrantyStartedAt.toIso8601String(),