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/rent_dto.dart

@@ -12,7 +12,15 @@ class RentDto with _$RentDto {
     int? id,
     @JsonKey(name: 'started_at') required DateTime startedAt,
     @JsonKey(name: 'ended_at') required DateTime endedAt,
-    @JsonKey(name: 'equipment_history_Id') required int equipmentHistoryId,
+    @JsonKey(name: 'equipment_history_id') int? equipmentHistoryId,
+    
+    // JOIN fields from backend (계산된 필드들)
+    @JsonKey(name: 'equipment_serial') String? equipmentSerial,
+    @JsonKey(name: 'equipment_model') String? equipmentModel,
+    @JsonKey(name: 'company_name') String? companyName,
+    @JsonKey(name: 'days_remaining') int? daysRemaining,
+    @JsonKey(name: 'is_active') bool? isActive,
+    @JsonKey(name: 'total_days') int? totalDays,
     
     // Related entities (optional, populated in GET requests)
     EquipmentHistoryDto? equipmentHistory,
@@ -27,7 +35,7 @@ class RentRequestDto with _$RentRequestDto {
   const factory RentRequestDto({
     @JsonKey(name: 'started_at') required DateTime startedAt,
     @JsonKey(name: 'ended_at') required DateTime endedAt,
-    @JsonKey(name: 'equipment_history_Id') required int equipmentHistoryId,
+    @JsonKey(name: 'equipment_history_id') required int equipmentHistoryId,
   }) = _RentRequestDto;
 
   factory RentRequestDto.fromJson(Map<String, dynamic> json) =>
@@ -39,7 +47,7 @@ class RentUpdateRequestDto with _$RentUpdateRequestDto {
   const factory RentUpdateRequestDto({
     @JsonKey(name: 'started_at') DateTime? startedAt,
     @JsonKey(name: 'ended_at') DateTime? endedAt,
-    @JsonKey(name: 'equipment_history_Id') int? equipmentHistoryId,
+    @JsonKey(name: 'equipment_history_id') int? equipmentHistoryId,
   }) = _RentUpdateRequestDto;
 
   factory RentUpdateRequestDto.fromJson(Map<String, dynamic> json) =>