feat: Equipment DTO 호환성 수정 전 백업 커밋

- Equipment DTO 필드명 변경 (name → equipment_number 등) 완료
- Phase 1-7 파생 수정사항 체계적 진행 예정
- 통합 모델 정리, Controller 동기화, UI 업데이트 예정

🤖 Generated with [Claude Code](https://claude.ai/code)

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

lib/data/models/lookups/lookup_data.dart

@@ -9,8 +9,10 @@ class LookupData with _$LookupData {
   const factory LookupData({
     @JsonKey(name: 'manufacturers', defaultValue: []) required List<LookupItem> manufacturers,
     @JsonKey(name: 'equipment_names', defaultValue: []) required List<EquipmentNameItem> equipmentNames,
-    @JsonKey(name: 'equipment_categories', defaultValue: []) required List<CategoryItem> equipmentCategories,
+    @JsonKey(name: 'equipment_categories', defaultValue: []) required List<CategoryCombinationItem> equipmentCategories,
     @JsonKey(name: 'equipment_statuses', defaultValue: []) required List<StatusItem> equipmentStatuses,
+    @JsonKey(name: 'companies', defaultValue: []) required List<LookupItem> companies,
+    @JsonKey(name: 'warehouses', defaultValue: []) required List<LookupItem> warehouses,
   }) = _LookupData;
 
   factory LookupData.fromJson(Map<String, dynamic> json) =>
@@ -21,7 +23,7 @@ class LookupData with _$LookupData {
 @freezed
 class LookupItem with _$LookupItem {
   const factory LookupItem({
-    required int id,
+    int? id,
     required String name,
   }) = _LookupItem;
 
@@ -33,7 +35,7 @@ class LookupItem with _$LookupItem {
 @freezed
 class EquipmentNameItem with _$EquipmentNameItem {
   const factory EquipmentNameItem({
-    required int id,
+    int? id,
     required String name,
     @JsonKey(name: 'model_number') String? modelNumber,
   }) = _EquipmentNameItem;
@@ -42,7 +44,20 @@ class EquipmentNameItem with _$EquipmentNameItem {
       _$EquipmentNameItemFromJson(json);
 }
 
-/// 카테고리 Lookup 아이템
+/// 카테고리 조합 Lookup 아이템 (백엔드 API 실제 구조)
+@freezed
+class CategoryCombinationItem with _$CategoryCombinationItem {
+  const factory CategoryCombinationItem({
+    required String category1,
+    required String category2,
+    required String category3,
+  }) = _CategoryCombinationItem;
+
+  factory CategoryCombinationItem.fromJson(Map<String, dynamic> json) =>
+      _$CategoryCombinationItemFromJson(json);
+}
+
+/// 개별 카테고리 아이템 (UI용)
 @freezed
 class CategoryItem with _$CategoryItem {
   const factory CategoryItem({