Add debug logs for banner update

frontend/src/app/admin/cars/page.tsx

@@ -325,6 +325,10 @@ export default function CarsAdminPage() {
       const currentBannerIds = new Set(bannerCarIds);
       const newBannerIds = localBannerSelections;
 
+      console.log('=== Banner Update Debug ===');
+      console.log('Current banner IDs (from DB):', [...currentBannerIds]);
+      console.log('New banner IDs (user selection):', [...newBannerIds]);
+
       // 추가할 배너
       const toAdd: number[] = [];
       newBannerIds.forEach(id => {
@@ -341,12 +345,19 @@ export default function CarsAdminPage() {
         }
       });
 
+      console.log('To Add:', toAdd);
+      console.log('To Remove:', toRemove);
+
       // 배너 추가/제거 API 호출
       for (const carId of toRemove) {
-        await heroBannersApi.adminToggleBanner(carId); // 제거
+        console.log('Removing banner for car:', carId);
+        const result = await heroBannersApi.adminToggleBanner(carId);
+        console.log('Remove result:', result);
       }
       for (const carId of toAdd) {
-        await heroBannersApi.adminToggleBanner(carId); // 추가
+        console.log('Adding banner for car:', carId);
+        const result = await heroBannersApi.adminToggleBanner(carId);
+        console.log('Add result:', result);
       }
 
       // 배너 순서 업데이트 (bannerOrderedCars 순서대로)
@@ -360,12 +371,17 @@ export default function CarsAdminPage() {
         }
       });
 
+      console.log('Final ordered IDs:', orderedIds);
+
       if (orderedIds.length > 0) {
-        await heroBannersApi.adminReorderBanners(orderedIds);
+        const reorderResult = await heroBannersApi.adminReorderBanners(orderedIds);
+        console.log('Reorder result:', reorderResult);
       }
 
       // 목록 새로고침
+      console.log('Reloading cars...');
       await loadLocalCars();
+      console.log('=== Banner Update Complete ===');
       alert(`배너가 업데이트되었습니다. (추가: ${toAdd.length}, 제거: ${toRemove.length})`);
     } catch (err) {
       console.error('Failed to update banners:', err);