refactor(MemberCoupon): 将时间相关字段从 LocalDateTime 改为 LocalDate

- 将 validStartDate、validEndDate 和 createDate 字段类型从 LocalDateTime 改为 LocalDate
- 这个改动更准确地反映了这些字段只需要日期信息，不需要具体时间

src/main/java/com/xynet/marketing/entity/MemberCoupon.java

@@ -8,6 +8,7 @@ import lombok.EqualsAndHashCode;
 import lombok.experimental.Accessors;
 
 import java.io.Serializable;
+import java.time.LocalDate;
 import java.time.LocalDateTime;
 
 /**
@@ -25,6 +26,7 @@ public class MemberCoupon implements Serializable {
     @TableId(type = IdType.AUTO)
     private Integer id;
 
+
     /**
      * 商户id
      */
@@ -43,9 +45,9 @@ public class MemberCoupon implements Serializable {
 
     private Boolean isAllGoods;
 
-    private LocalDateTime validStartDate;
+    private LocalDate validStartDate;
 
-    private LocalDateTime validEndDate;
+    private LocalDate validEndDate;
 
     private Integer useMinPrice;
 
@@ -63,7 +65,7 @@ public class MemberCoupon implements Serializable {
 
     private LocalDateTime updateTime;
 
-    private String createDate;
+    private LocalDate createDate;
 
     private String createOrderId;
 }