refactor: UI 화면 통합 및 불필요한 파일 정리

- 모든 *_redesign.dart 파일을 기본 화면 파일로 통합
- 백업용 컨트롤러 파일들 제거 (*_controller.backup.dart)
- 사용하지 않는 예제 및 테스트 파일 제거
- Clean Architecture 적용 후 남은 정리 작업 완료
- 테스트 코드 정리 및 구조 개선 준비

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

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

test/integration/automated/checkbox_equipment_out_test.dart

@@ -162,7 +162,7 @@ class CheckboxEquipmentOutTest {
       if (controller.equipments.isNotEmpty) {
         // 첫 번째 장비 선택
         final equipment = controller.equipments.first;
-        controller.selectEquipment(equipment.id, equipment.status, true);
+        controller.selectEquipment(equipment);
         
         final isSelected = controller.selectedEquipmentIds.contains('${equipment.id}:${equipment.status}');
         result['steps'].add({
@@ -173,7 +173,7 @@ class CheckboxEquipmentOutTest {
         });
         
         // 선택 해제
-        controller.selectEquipment(equipment.id, equipment.status, false);
+        controller.selectEquipment(equipment); // Toggle to deselect
         final isDeselected = !controller.selectedEquipmentIds.contains('${equipment.id}:${equipment.status}');
         result['steps'].add({
           'name': '장비 선택 해제',
@@ -207,7 +207,7 @@ class CheckboxEquipmentOutTest {
         final equipmentsToSelect = controller.equipments.take(3).toList();
         
         for (final equipment in equipmentsToSelect) {
-          controller.selectEquipment(equipment.id, equipment.status, true);
+          controller.selectEquipment(equipment);
         }
         
         final selectedCount = controller.getSelectedEquipmentCount();
@@ -249,7 +249,7 @@ class CheckboxEquipmentOutTest {
       
       // 전체 선택 시뮬레이션
       for (final equipment in controller.equipments) {
-        controller.selectEquipment(equipment.id, equipment.status, true);
+        controller.selectEquipment(equipment);
       }
       
       final selectedCount = controller.getSelectedEquipmentCount();
@@ -264,7 +264,7 @@ class CheckboxEquipmentOutTest {
       
       // 전체 해제
       for (final equipment in controller.equipments) {
-        controller.selectEquipment(equipment.id, equipment.status, false);
+        controller.selectEquipment(equipment); // Toggle to deselect
       }
       
       final afterDeselectCount = controller.getSelectedEquipmentCount();
@@ -293,7 +293,7 @@ class CheckboxEquipmentOutTest {
     
     try {
       // 입고 상태 필터 적용
-      await controller.changeStatusFilter('available');
+      controller.changeStatusFilter('available');
       
       result['steps'].add({
         'name': '입고 상태 필터 적용',
@@ -310,7 +310,7 @@ class CheckboxEquipmentOutTest {
             .toList();
         
         for (final equipment in availableEquipments) {
-          controller.selectEquipment(equipment.id, equipment.status, true);
+          controller.selectEquipment(equipment);
         }
         
         final selectedInStockCount = controller.getSelectedEquipmentCountByStatus('available');
@@ -344,7 +344,7 @@ class CheckboxEquipmentOutTest {
       
       // 1. 입고 상태 장비 로드
       await controller.loadData(isRefresh: true);
-      await controller.changeStatusFilter('available');
+      controller.changeStatusFilter('available');
       
       final availableCount = controller.equipments
           .where((e) => e.status == 'available')
@@ -362,7 +362,7 @@ class CheckboxEquipmentOutTest {
             .where((e) => e.status == 'available')
             .first;
         
-        controller.selectEquipment(singleEquipment.id, singleEquipment.status, true);
+        controller.selectEquipment(singleEquipment);
         
         result['steps'].add({
           'name': '단일 장비 선택',
@@ -433,7 +433,7 @@ class CheckboxEquipmentOutTest {
           
           // 4. 출고 후 상태 확인
           await controller.loadData(isRefresh: true);
-          await controller.changeStatusFilter('inuse');
+          controller.changeStatusFilter('inuse');
           
           final inUseCount = controller.equipments
               .where((e) => e.status == 'inuse')