refactor(Admin): 更新微信小程序密钥并优化代码

- 更新微信小程序 secret 为实际值- 移除 BaseEntity 中未使用的 Date 导入
- 优化 OrderServiceImpl 中的 productMapper 注入方式

ruoyi-admin/src/main/resources/application.yml

@@ -380,7 +380,7 @@ wechat:
       secret: your_wechat_secret         # 应用密钥
   mini-program:
     app-id: wx87a5db19138da60d
-    secret: your_wechat_secret
+    secret: 856ca8bae38ccaecc1353c9abedf6b41
 
 http:
   client:

ruoyi-common/ruoyi-common-mybatis/src/main/java/org/dromara/common/mybatis/core/domain/BaseEntity.java

@@ -9,7 +9,6 @@ import lombok.Data;
 import java.io.Serial;
 import java.io.Serializable;
 import java.time.LocalDateTime;
-import java.util.Date;
 import java.util.HashMap;
 import java.util.Map;
 

ruoyi-modules/ruoyi-order/src/main/java/com/wzj/soopin/order/service/impl/OrderServiceImpl.java

@@ -83,7 +83,7 @@ public class OrderServiceImpl extends ServiceImpl<OrderMapper, Order> implements
      */
     private final static String ORDER_SN_PREFIX = "WZJ";
 
-    private ProductMapper productMapper;
+    private final ProductMapper productMapper;
 
 
     /**