fix: Fix handleImport to send correct data format

- Changed from { car_ids: [...] } to { cars: [...] } format
- Now includes full car details required by backend ImportCarsRequest schema

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

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

@@ -685,9 +685,27 @@ export default function CarsAdminPage() {
 
     setImporting(true);
     try {
-      const { data } = await api.post('/carmodoo/import', {
-        car_ids: Array.from(selectedCars),
-      });
+      // 선택된 차량들의 상세 정보를 올바른 형식으로 변환
+      const selectedCarsList = searchResults.filter(car => selectedCars.has(car.id));
+      const carsToImport = selectedCarsList.map(car => ({
+        car_no: car.id,
+        car_name: car.car_name || '',
+        maker_name: car.maker_name,
+        model_name: car.model_name,
+        year: car.year,
+        mileage: car.mileage,
+        price: car.price,
+        fuel: car.fuel,
+        transmission: car.transmission,
+        color: car.color,
+        displacement: car.displacement,
+        main_image: car.main_image,
+        check_num: car.check_num,
+        car_key: car.car_key,
+        dealer_description: editedDescriptions[car.id] ?? car.dealer_description,
+      }));
+
+      const { data } = await api.post('/carmodoo/import', { cars: carsToImport });
 
       // PDF 상태 상세 정보 추출
       const pdfDetails = data.imported?.map((item: any) => ({