feat：邮费类型

src/Goods/Enum/GoodsEnum.php

@@ -16,4 +16,9 @@ class GoodsEnum
 
 	const SERVER_GOODS = 1;//服务商品
 	const ENTITY_GOODS = 2;//实体商品
+
+
+	const FREIGHT_FREE = 1; //包邮
+	const FREIGHT_DISTANCE = 2;//距离邮费
+	const FREIGHT_WEIGHT = 3;//重量邮费
 }
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