refactor: BarcodeService 인터페이스 분리

src/main/java/com/sscanner/team/barcode/service/BarcodeService.java → src/main/java/com/sscanner/team/barcode/service/BarcodeServiceImpl.java

@@ -15,7 +15,7 @@
 
 @Service
 @RequiredArgsConstructor
-public class BarcodeService {
+public class BarcodeServiceImpl implements BarcodeService {
 
  private final BarcodeRepository barcodeRepository;
  private final ImageService imageService;