feat(rag): 添加文件相对路径支持功能

- 在FileInfo DTO中新增relativePath字段
- 实现文件相对路径的规范化处理逻辑
- 将文件相对路径存储到元数据中
- 前端添加文件路径解析和显示功能
- 优化路径分隔符统一处理机制
- 更新文件列表展示逻辑以支持路径层级结构

backend/services/rag-indexer-service/src/main/java/com/datamate/rag/indexer/application/KnowledgeBaseService.java

@@ -35,7 +35,9 @@ import org.springframework.transaction.annotation.Transactional;
 import org.springframework.util.StringUtils;
 
 import java.util.Collections;
+import java.util.HashMap;
 import java.util.List;
+import java.util.Map;
 import java.util.Optional;
 
 /**
@@ -47,6 +49,8 @@ import java.util.Optional;
 @Service
 @RequiredArgsConstructor
 public class KnowledgeBaseService {
+    private static final String RELATIVE_PATH_KEY = "relativePath";
+    private static final String PATH_SEPARATOR = "/";
     private final KnowledgeBaseRepository knowledgeBaseRepository;
     private final RagFileRepository ragFileRepository;
     private final ApplicationEventPublisher eventPublisher;
@@ -146,6 +150,12 @@ public class KnowledgeBaseService {
             ragFile.setKnowledgeBaseId(knowledgeBase.getId());
             ragFile.setFileId(fileInfo.id());
             ragFile.setFileName(fileInfo.fileName());
+            String relativePath = normalizeRelativePath(fileInfo.relativePath());
+            if (StringUtils.hasText(relativePath)) {
+                Map<String, Object> metadata = new HashMap<>();
+                metadata.put(RELATIVE_PATH_KEY, relativePath);
+                ragFile.setMetadata(metadata);
+            }
             ragFile.setStatus(FileStatus.UNPROCESSED);
             return ragFile;
         }).toList();
@@ -153,6 +163,17 @@ public class KnowledgeBaseService {
         eventPublisher.publishEvent(new DataInsertedEvent(knowledgeBase, request));
     }
 
+    private String normalizeRelativePath(String relativePath) {
+        if (!StringUtils.hasText(relativePath)) {
+            return "";
+        }
+        String normalized = relativePath.replace("\\", PATH_SEPARATOR).trim();
+        while (normalized.startsWith(PATH_SEPARATOR)) {
+            normalized = normalized.substring(1);
+        }
+        return normalized;
+    }
+
     public PagedResponse<RagFile> listFiles(String knowledgeBaseId, RagFileReq request) {
         IPage<RagFile> page = new Page<>(request.getPage(), request.getSize());
         request.setKnowledgeBaseId(knowledgeBaseId);
@@ -222,4 +243,4 @@ public class KnowledgeBaseService {
         });
         return searchResults;
     }
-}
+}

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

@@ -21,6 +21,6 @@ public class AddFilesReq {
     private String delimiter;
     private List<FileInfo> files;
 
-    public record FileInfo(String id, String fileName) {
+    public record FileInfo(String id, String fileName, String relativePath) {
     }
 }