【新增】同城配送运费增加超过20公里自定义每公里金额，增加订单超过多少金额免运费设置。

CoreCms.Net.Configuration/SystemSettingConstVars.cs

@@ -846,6 +846,16 @@ namespace CoreCms.Net.Configuration
         /// </summary>
         public static readonly string IntraCityServiceBy20KM = "intraCityServiceBy20KM";
 
+        /// <summary>
+        /// 同城配送超过20公里内
+        /// </summary>
+        public static readonly string IntraCityServiceByExceed20KM = "intraCityServiceByExceed20KM";
+
+        /// <summary>
+        /// 同城配送多少钱免运费
+        /// </summary>
+        public static readonly string IntraCityServiceFreeCredit = "intraCityServiceFreeCredit";
+