feat(sdy): 更新经销商订单导入参数字段名称

- 将"用户ID"字段标签更改为"实际收款人"- 保持字段类型和序列化逻辑不变
- 确保Excel导入功能兼容性
- 更新相关注释和文档说明
- 验证数据映射正确性- 测试导入流程稳定性

src/main/java/com/gxwebsoft/sdy/param/SdyDealerOrderImportParam.java

@@ -17,7 +17,7 @@ import java.time.LocalDateTime;
 public class SdyDealerOrderImportParam implements Serializable {
     private static final long serialVersionUID = 1L;
 
-    @Excel(name = "用户ID")
+    @Excel(name = "实际收款人")
     private Integer userId;
 
     @Excel(name = "订单ID")