fix: 优化后端各模块 handler

- database_handler, knowledge_handler, model_handler
- neo4j_handler, sub_table_handler
- system_handler, upload_handler
- knowledge_service, upload_service

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

server/internal/service/upload_service.go

@@ -94,7 +94,7 @@ func (s *UploadService) Upload(file *multipart.FileHeader) (*UploadResponse, err
 	if s.cfg.UploadMode == "minio" {
 		return s.uploadToMinIO(f, filename, fileKey, file.Size)
 	}
-	return s.uploadToLocal(f, filename, fileKey)
+	return s.uploadToLocal(f, filename, fileKey, "")
 }
 
 // UploadWithConfig 上传文件（使用指定配置）
@@ -116,7 +116,29 @@ func (s *UploadService) UploadWithConfig(file *multipart.FileHeader, storageConf
 		return s.uploadToMinIOWithConfig(f, filename, fileKey, file.Size, storageConfig)
 	}
 	// 默认使用本地存储
-	return s.uploadToLocal(f, filename, fileKey)
+	return s.uploadToLocal(f, filename, fileKey, "")
+}
+
+// UploadToKnowledgeBase 上传文件到知识库（本地存储时按知识库名称分类）
+func (s *UploadService) UploadToKnowledgeBase(file *multipart.FileHeader, storageConfig model.StorageConfig, knowledgeBaseName string) (*UploadResponse, error) {
+	// 打开文件
+	f, err := file.Open()
+	if err != nil {
+		return &UploadResponse{Success: false, Message: err.Error()}, nil
+	}
+	defer f.Close()
+
+	// 生成唯一文件名
+	ext := filepath.Ext(file.Filename)
+	filename := fmt.Sprintf("%s%s", uuid.New().String(), ext)
+	fileKey := strings.TrimSuffix(filename, ext)
+
+	// 根据配置选择存储方式
+	if storageConfig.Type == "minio" {
+		return s.uploadToMinIOWithConfig(f, filename, fileKey, file.Size, storageConfig)
+	}
+	// 本地存储，使用知识库名称作为子目录
+	return s.uploadToLocal(f, filename, fileKey, knowledgeBaseName)
 }
 
 // uploadToMinIOWithConfig 使用指定配置上传到 MinIO
@@ -217,9 +239,18 @@ func (s *UploadService) uploadToMinIO(f multipart.File, filename, fileKey string
 }
 
 // uploadToLocal 上传到本地
-func (s *UploadService) uploadToLocal(f multipart.File, filename, fileKey string) (*UploadResponse, error) {
-	// 确保目录存在
-	uploadPath := s.cfg.UploadLocalPath
+// knowledgeBaseName: 知识库名称，如果为空则使用全局配置目录，否则使用 resources/{知识库名称}/
+func (s *UploadService) uploadToLocal(f multipart.File, filename, fileKey string, knowledgeBaseName string) (*UploadResponse, error) {
+	// 确定存储路径
+	var uploadPath string
+	if knowledgeBaseName != "" {
+		// 使用 resources/{知识库名称}/ 路径
+		uploadPath = filepath.Join("resources", knowledgeBaseName)
+	} else {
+		// 使用全局配置路径
+		uploadPath = s.cfg.UploadLocalPath
+	}
+
 	if err := os.MkdirAll(uploadPath, 0755); err != nil {
 		return &UploadResponse{Success: false, Message: fmt.Sprintf("failed to create directory: %v", err)}, nil
 	}
@@ -259,7 +290,8 @@ func (s *UploadService) DeleteFile(filename string) error {
 }
 
 // DeleteFileWithConfig 使用指定配置删除文件
-func (s *UploadService) DeleteFileWithConfig(filename string, storageConfig model.StorageConfig) error {
+// 注意：此方法需要知识库名称才能正确删除本地文件
+func (s *UploadService) DeleteFileWithConfig(filename string, storageConfig model.StorageConfig, knowledgeBaseName string) error {
 	if storageConfig.Type == "minio" {
 		// 创建 MinIO 客户端
 		client, err := minio.New(storageConfig.Endpoint, &minio.Options{
@@ -275,7 +307,12 @@ func (s *UploadService) DeleteFileWithConfig(filename string, storageConfig mode
 	}
 
 	// 本地删除
-	path := filepath.Join(s.cfg.UploadLocalPath, filename)
+	var path string
+	if knowledgeBaseName != "" {
+		path = filepath.Join("resources", knowledgeBaseName, filename)
+	} else {
+		path = filepath.Join(s.cfg.UploadLocalPath, filename)
+	}
 	return os.Remove(path)
 }