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

examples/config_example.go

@@ -65,16 +65,27 @@ func main() {
 
 	// 4. 使用CORS配置
 	fmt.Println("\n=== CORS Config ===")
-	corsConfig := cfg.GetCORS()
-	if corsConfig != nil {
-		fmt.Printf("Allowed Origins: %v\n", corsConfig.AllowedOrigins)
-		fmt.Printf("Allowed Methods: %v\n", corsConfig.AllowedMethods)
-		fmt.Printf("Max Age: %d\n", corsConfig.MaxAge)
+	configCORS := cfg.GetCORS()
+	if configCORS != nil {
+		fmt.Printf("Allowed Origins: %v\n", configCORS.AllowedOrigins)
+		fmt.Printf("Allowed Methods: %v\n", configCORS.AllowedMethods)
+		fmt.Printf("Max Age: %d\n", configCORS.MaxAge)
 	}
 
 	// 使用CORS配置创建中间件
+	var middlewareCORS *middleware.CORSConfig
+	if configCORS != nil {
+		middlewareCORS = middleware.NewCORSConfig(
+			configCORS.AllowedOrigins,
+			configCORS.AllowedMethods,
+			configCORS.AllowedHeaders,
+			configCORS.ExposedHeaders,
+			configCORS.AllowCredentials,
+			configCORS.MaxAge,
+		)
+	}
 	chain := middleware.NewChain(
-		middleware.CORS(corsConfig),
+		middleware.CORS(middlewareCORS),
 	)
 	fmt.Printf("CORS middleware created: %v\n", chain != nil)