feat(customer): 添加客户消息封面图片字段

- 在CustomerMessage实体类中新增coverUrl字段
- 在CustomerMessageBo业务对象中新增coverUrl字段
- 在CustomerMessageVo视图对象中新增coverUrl字段
- 为新字段添加相应的注释说明

ruoyi-modules/ruoyi-customer/src/main/java/org/dromara/customer/domain/CustomerMessage.java

@@ -73,5 +73,10 @@ public class CustomerMessage extends TenantEntity {
      */
     private String remark;
 
+    /**
+     * 封面图片
+     */
+    private String coverUrl;
+
 
 }

ruoyi-modules/ruoyi-customer/src/main/java/org/dromara/customer/domain/bo/CustomerMessageBo.java

@@ -65,5 +65,8 @@ public class CustomerMessageBo extends BaseEntity {
      */
     private String remark;
 
-
+    /**
+     * 封面图片
+     */
+    private String coverUrl;
 }

ruoyi-modules/ruoyi-customer/src/main/java/org/dromara/customer/domain/vo/CustomerMessageVo.java

@@ -66,4 +66,9 @@ public class CustomerMessageVo implements Serializable {
     private Date createTime;
 
     private String status;
+
+    /**
+     * 封面图片
+     */
+    private String coverUrl;
 }