feat: 集成 AI-Core gRPC 文档解析服务

- 新增 AICoreClient 客户端
- 添加 document_parser_client.go
- 知识库服务集成 AI-Core 解析
- 配置中添加 ai_core_service_addr

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

server/internal/config/config.go

@@ -14,8 +14,14 @@ import (
 type Config struct {
 	Port              string
 	JWTSecret         string
-	DatabaseURL       string
+	DatabaseHost      string
+	DatabasePort      string
+	DatabaseUser      string
+	DatabasePassword  string
+	DatabaseName      string
+	DatabaseURL       string // 拼接后的完整连接字符串
 	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"
@@ -39,7 +45,13 @@ func Load() *Config {
 	viper.SetDefault("port", "8080")
 	viper.SetDefault("jwt_secret", "your-secret-key-change-in-production")
 	viper.SetDefault("python_service_url", "http://localhost:8081")
-	viper.SetDefault("database_url", "root:root@tcp(localhost:3306)/x_agents?charset=utf8mb4&parseTime=True&loc=Local")
+	viper.SetDefault("ai_core_service_addr", "localhost:50051")
+	// 数据库默认配置
+	viper.SetDefault("database_host", "localhost")
+	viper.SetDefault("database_port", "3306")
+	viper.SetDefault("database_user", "root")
+	viper.SetDefault("database_password", "root")
+	viper.SetDefault("database_name", "x_agents")
 	// 文件上传默认配置
 	viper.SetDefault("upload_mode", "local")
 	viper.SetDefault("upload_local_path", "resource/files")
@@ -54,11 +66,26 @@ func Load() *Config {
 		log.Printf("Using default config: %v", err)
 	}
 
+	// 拼接数据库连接字符串
+	dbHost := viper.GetString("database_host")
+	dbPort := viper.GetString("database_port")
+	dbUser := viper.GetString("database_user")
+	dbPassword := viper.GetString("database_password")
+	dbName := viper.GetString("database_name")
+	databaseURL := fmt.Sprintf("%s:%s@tcp(%s:%s)/%s?charset=utf8mb4&parseTime=True&loc=Local",
+		dbUser, dbPassword, dbHost, dbPort, dbName)
+
 	return &Config{
-		Port:             viper.GetString("port"),
-		JWTSecret:        viper.GetString("jwt_secret"),
-		DatabaseURL:      viper.GetString("database_url"),
-		PythonServiceURL: viper.GetString("python_service_url"),
+		Port:              viper.GetString("port"),
+		JWTSecret:         viper.GetString("jwt_secret"),
+		DatabaseURL:       databaseURL,
+		DatabaseHost:      dbHost,
+		DatabasePort:      dbPort,
+		DatabaseUser:      dbUser,
+		DatabasePassword:  dbPassword,
+		DatabaseName:      dbName,
+		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"),