初始化购物车接口校验是否需要餐位费，不需要删除旧数据

src/main/java/com/chaozhanggui/system/cashierservice/constant/TableConstant.java

@@ -0,0 +1,6 @@
+package com.chaozhanggui.system.cashierservice.constant;
+
+public interface TableConstant {
+
+    String CART_SEAT_ID = "-999";
+}