调整工具类的方法，优化方法调用及增加迁移工具及其用法

middleware/cors.go

@@ -43,6 +43,36 @@ func DefaultCORSConfig() *CORSConfig {
 	}
 }
 
+// NewCORSConfig 从配置参数创建 CORSConfig
+// 用于从 config 包的 CORSConfig 转换为 middleware 的 CORSConfig
+// 避免循环依赖
+func NewCORSConfig(allowedOrigins, allowedMethods, allowedHeaders, exposedHeaders []string, allowCredentials bool, maxAge int) *CORSConfig {
+	cfg := &CORSConfig{
+		AllowedOrigins:   allowedOrigins,
+		AllowedMethods:   allowedMethods,
+		AllowedHeaders:   allowedHeaders,
+		ExposedHeaders:   exposedHeaders,
+		AllowCredentials: allowCredentials,
+		MaxAge:           maxAge,
+	}
+	
+	// 设置默认值（如果为空）
+	if len(cfg.AllowedOrigins) == 0 {
+		cfg.AllowedOrigins = []string{"*"}
+	}
+	if len(cfg.AllowedMethods) == 0 {
+		cfg.AllowedMethods = []string{"GET", "POST", "PUT", "DELETE", "PATCH", "OPTIONS"}
+	}
+	if len(cfg.AllowedHeaders) == 0 {
+		cfg.AllowedHeaders = []string{"Content-Type", "Authorization", "X-Requested-With", "X-Timezone"}
+	}
+	if cfg.MaxAge == 0 {
+		cfg.MaxAge = 86400
+	}
+	
+	return cfg
+}
+
 // CORS CORS中间件
 func CORS(config ...*CORSConfig) func(http.Handler) http.Handler {
 	var cfg *CORSConfig