[ADD] FileUploadRepository 추가

src/main/java/kr/re/etri/autoflow/repository/FileUploadRepository.java

@@ -0,0 +1,20 @@
+package kr.re.etri.autoflow.repository;
+
+import kr.re.etri.autoflow.entity.FileUploadEntity;
+import org.springframework.data.jpa.repository.JpaRepository;
+import org.springframework.stereotype.Repository;
+
+import java.util.List;
+
+@Repository
+public interface FileUploadRepository extends JpaRepository<FileUploadEntity, Long> {
+
+    // 연관 엔티티 타입 + ID 기준 조회
+    List<FileUploadEntity> findByRefTypeAndRefId(String refType, Long refId);
+
+    // 업로더 기준 조회
+    List<FileUploadEntity> findByRegUserId(String regUserId);
+
+    // Dataset 제목 기준 조회 (optional)
+    List<FileUploadEntity> findByDatasetTitleContaining(String datasetTitle);
+}