feat: 完善后端知识库服务和配置

- 优化 AI-Core 客户端调用
- 添加更多知识库配置选项
- 完善文档解析逻辑

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

server/internal/config/config.go

@@ -23,9 +23,10 @@ type Config struct {
 	PythonServiceURL  string
 	AICoreServiceAddr string // AI-Core gRPC 服务地址，如 "localhost:50051"
 	// 文件上传配置
-	UploadMode      string // "local" 或 "minio"
-	UploadLocalPath string // 本地存储路径，如 "resource/files"
-	ServerBaseURL   string // 服务器基础 URL，用于生成本地文件 URL
+	UploadMode        string // "local" 或 "minio"
+	UploadLocalPath   string // 本地存储路径，如 "resource/files"
+	ServerBaseURL     string // 服务器基础 URL，用于生成本地文件 URL
+	MarkdownLocalPath string // Markdown 文件存储路径，如 "resource/markdown"
 	// MinIO 配置
 	MinIOEndpoint   string
 	MinIOAccessKey  string
@@ -56,6 +57,7 @@ func Load() *Config {
 	viper.SetDefault("upload_mode", "local")
 	viper.SetDefault("upload_local_path", "resource/files")
 	viper.SetDefault("server_base_url", "http://localhost:8080")
+	viper.SetDefault("markdown_local_path", "resource/markdown")
 	viper.SetDefault("minio_endpoint", "localhost:9000")
 	viper.SetDefault("minio_access_key", "")
 	viper.SetDefault("minio_secret_key", "")
@@ -87,9 +89,10 @@ func Load() *Config {
 		PythonServiceURL:  viper.GetString("python_service_url"),
 		AICoreServiceAddr:  viper.GetString("ai_core_service_addr"),
 		// 文件上传配置
-		UploadMode:      viper.GetString("upload_mode"),
-		UploadLocalPath: viper.GetString("upload_local_path"),
-		ServerBaseURL:   viper.GetString("server_base_url"),
+		UploadMode:        viper.GetString("upload_mode"),
+		UploadLocalPath:   viper.GetString("upload_local_path"),
+		ServerBaseURL:     viper.GetString("server_base_url"),
+		MarkdownLocalPath: viper.GetString("markdown_local_path"),
 		// MinIO 配置
 		MinIOEndpoint:  viper.GetString("minio_endpoint"),
 		MinIOAccessKey: viper.GetString("minio_access_key"),