fix(data-management): 修复SQL映射中的比较运算符转义问题

- 将XML文件中的 <> 运算符替换为 &lt;&gt; 实体编码
- 确保SQL查询在XML解析器中正确处理比较操作
- 修复了数据集文件状态过滤的查询逻辑
- 保持了原有的业务逻辑不变，仅修正语法问题

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

@@ -42,14 +42,14 @@
         SELECT COUNT(*)
         FROM t_dm_dataset_files
         WHERE dataset_id = #{datasetId}
-          AND (status IS NULL OR status <> 'ARCHIVED')
+          AND (status IS NULL OR status &lt;&gt; 'ARCHIVED')
     </select>
 
     <select id="countNonDerivedByDatasetId" parameterType="string" resultType="long">
         SELECT COUNT(*)
         FROM t_dm_dataset_files
         WHERE dataset_id = #{datasetId}
-          AND (status IS NULL OR status <> 'ARCHIVED')
+          AND (status IS NULL OR status &lt;&gt; 'ARCHIVED')
           AND (metadata IS NULL OR JSON_EXTRACT(metadata, '$.derived_from_file_id') IS NULL)
     </select>
 
@@ -61,7 +61,7 @@
         SELECT COALESCE(SUM(file_size), 0)
         FROM t_dm_dataset_files
         WHERE dataset_id = #{datasetId}
-          AND (status IS NULL OR status <> 'ARCHIVED')
+          AND (status IS NULL OR status &lt;&gt; 'ARCHIVED')
     </select>
 
   <select id="findByDatasetIdAndFileName" resultType="com.datamate.datamanagement.domain.model.dataset.DatasetFile">
@@ -69,7 +69,7 @@
         FROM t_dm_dataset_files
         WHERE dataset_id = #{datasetId}
           AND file_name = #{fileName}
-          AND (status IS NULL OR status <> 'ARCHIVED')
+          AND (status IS NULL OR status &lt;&gt; 'ARCHIVED')
         ORDER BY version DESC, upload_time DESC
         LIMIT 1
     </select>
@@ -138,7 +138,7 @@
         <foreach collection="datasetIds" item="datasetId" open="(" separator="," close=")">
             #{datasetId}
         </foreach>
-          AND (status IS NULL OR status <> 'ARCHIVED')
+          AND (status IS NULL OR status &lt;&gt; 'ARCHIVED')
           AND (metadata IS NULL OR JSON_EXTRACT(metadata, '$.derived_from_file_id') IS NULL)
         GROUP BY dataset_id
     </select>