feat(rag): 添加相对路径搜索功能并优化文件显示

- 在RagFileRepositoryImpl中新增relativePath字段和路径模式构建方法
- 实现buildRelativePathPattern方法用于构建相对路径搜索模式
- 修改page方法添加相对路径模糊查询支持
- 在RagFileReq DTO中添加relativePath参数字段
- 优化KnowledgeBaseDetail页面中的文件名显示逻辑
- 添加normalizePath函数处理文件路径规范化显示

backend/services/rag-indexer-service/src/main/java/com/datamate/rag/indexer/infrastructure/persistence/impl/RagFileRepositoryImpl.java

@@ -20,6 +20,8 @@ import java.util.List;
  */
 @Repository
 public class RagFileRepositoryImpl extends CrudRepository<RagFileMapper, RagFile> implements RagFileRepository {
+    private static final String RELATIVE_PATH_KEY = "\"relativePath\":\"";
+    private static final String PATH_SEPARATOR = "/";
     @Override
     public void removeByKnowledgeBaseId(String knowledgeBaseId) {
         lambdaUpdate().eq(RagFile::getKnowledgeBaseId, knowledgeBaseId).remove();
@@ -42,9 +44,25 @@ public class RagFileRepositoryImpl extends CrudRepository<RagFileMapper, RagFile
 
     @Override
     public IPage<RagFile> page(IPage<RagFile> page, RagFileReq request) {
+        String relativePathPattern = buildRelativePathPattern(request.getRelativePath());
         return lambdaQuery()
                 .eq(RagFile::getKnowledgeBaseId, request.getKnowledgeBaseId())
                 .like(StringUtils.hasText(request.getFileName()), RagFile::getFileName, request.getFileName())
+                .like(StringUtils.hasText(relativePathPattern), RagFile::getMetadata, relativePathPattern)
                 .page(page);
     }
+
+    private String buildRelativePathPattern(String relativePath) {
+        if (!StringUtils.hasText(relativePath)) {
+            return "";
+        }
+        String normalized = relativePath.replace("\\", PATH_SEPARATOR).trim();
+        while (normalized.startsWith(PATH_SEPARATOR)) {
+            normalized = normalized.substring(1);
+        }
+        if (!StringUtils.hasText(normalized)) {
+            return "";
+        }
+        return RELATIVE_PATH_KEY + normalized;
+    }
 }

backend/services/rag-indexer-service/src/main/java/com/datamate/rag/indexer/interfaces/dto/RagFileReq.java

@@ -14,5 +14,6 @@ import lombok.Setter;
 @Getter
 public class RagFileReq extends PagingQuery {
     private String fileName;
+    private String relativePath;
     private String knowledgeBaseId;
 }