Fix: EntityValidator 제거

Author: namgigun

src/main/java/com/back/domain/file/service/FileService.java

@@ -7,12 +7,8 @@
 import com.back.domain.file.dto.FileReadResponseDto;
 import com.back.domain.file.dto.FileUpdateResponseDto;
 import com.back.domain.file.dto.FileUploadResponseDto;
-import com.back.domain.file.entity.AttachmentMapping;
-import com.back.domain.file.entity.EntityType;
 import com.back.domain.file.entity.FileAttachment;
-import com.back.domain.file.repository.AttachmentMappingRepository;
 import com.back.domain.file.repository.FileAttachmentRepository;
-import com.back.domain.file.util.EntityValidator;
 import com.back.domain.user.entity.User;
 import com.back.domain.user.repository.UserRepository;
 import com.back.global.exception.CustomException;
@@ -21,8 +17,6 @@
 import org.springframework.beans.factory.annotation.Value;
 import org.springframework.stereotype.Service;
 import org.springframework.transaction.annotation.Transactional;
-import org.springframework.web.bind.annotation.PathVariable;
-import org.springframework.web.bind.annotation.RequestParam;
 import org.springframework.web.multipart.MultipartFile;
 
 import java.io.IOException;