refactor(data-management): 移除未使用的数据库操作方法并优化查询条件

- 从 DatasetFileMapper 中移除未使用的 update 和 deleteById 方法
- 从 DatasetMapper 中移除未使用的 deleteById 方法
- 在 Python 项目中添加 or_ 操作符导入用于复杂查询
- 为数据集文件查询添加状态过滤条件，排除已归档的文件记录

backend/services/data-management-service/src/main/java/com/datamate/datamanagement/infrastructure/persistence/mapper/DatasetFileMapper.java

@@ -26,8 +26,6 @@ public interface DatasetFileMapper extends BaseMapper<DatasetFile> {
                                      @Param("status") String status,
                                      RowBounds rowBounds);
 
-    int update(DatasetFile file);
-    int deleteById(@Param("id") String id);
     int updateFilePathPrefix(@Param("datasetId") String datasetId,
                              @Param("oldPrefix") String oldPrefix,
                              @Param("newPrefix") String newPrefix);

backend/services/data-management-service/src/main/java/com/datamate/datamanagement/infrastructure/persistence/mapper/DatasetMapper.java

@@ -28,6 +28,5 @@ public interface DatasetMapper extends BaseMapper<Dataset> {
                          @Param("keyword") String keyword,
                          @Param("tagNames") List<String> tagNames);
 
-    int deleteById(@Param("id") String id);
     AllDatasetStatisticsResponse getAllDatasetStatistics();
 }

backend/services/data-management-service/src/main/resources/mappers/DatasetFileMapper.xml

@@ -97,24 +97,6 @@
     </select>
 
 
-    <update id="update" parameterType="com.datamate.datamanagement.domain.model.dataset.DatasetFile">
-        UPDATE t_dm_dataset_files
-        SET file_name = #{fileName},
-            file_path = #{filePath},
-            logical_path = #{logicalPath},
-            version = #{version},
-            file_type = #{fileType},
-            file_size = #{fileSize},
-            upload_time = #{uploadTime},
-            last_access_time = #{lastAccessTime},
-            status = #{status}
-        WHERE id = #{id}
-    </update>
-
-    <delete id="deleteById" parameterType="string">
-        DELETE FROM t_dm_dataset_files WHERE id = #{id}
-    </delete>
-
     <update id="updateFilePathPrefix">
         UPDATE t_dm_dataset_files
         SET file_path = CONCAT(#{newPrefix}, SUBSTRING(file_path, LENGTH(#{oldPrefix}) + 1))

backend/services/data-management-service/src/main/resources/mappers/DatasetMapper.xml

@@ -139,10 +139,6 @@
         </where>
     </select>
 
-    <delete id="deleteById" parameterType="string">
-        DELETE FROM t_dm_datasets WHERE id = #{id}
-    </delete>
-
     <select id="getAllDatasetStatistics" resultType="com.datamate.datamanagement.interfaces.dto.AllDatasetStatisticsResponse">
       SELECT
         (SELECT COUNT(*) FROM t_dm_datasets) AS total_datasets,