feat: 会员价相关

src/main/java/com/chaozhanggui/system/cashierservice/entity/TbCashierCart.java

@@ -35,7 +35,7 @@ public class TbCashierCart implements Serializable {
 
     private BigDecimal salePrice;
     // 会员价
-    private BigDecimal memberPrice;
+    private BigDecimal memberPrice = BigDecimal.ZERO;
     private BigDecimal packFee;
 
     private Integer number;