refactor(order): 调整优惠排序逻辑

- 将券码优惠的排序顺序从 1 调整为 2，使其显示顺序低于限时立减- 将限时立减优惠的排序顺序从 2 调整为 1，使其显示在最前面

src/main/java/com/ycwl/basic/order/service/impl/OrderServiceImpl.java

@@ -126,7 +126,7 @@ public class OrderServiceImpl implements IOrderService {
             voucherDiscount.setDiscountType(DiscountType.VOUCHER);
             voucherDiscount.setDiscountName(voucherInfo.getBatchName());
             voucherDiscount.setDiscountAmount(voucherInfo.getActualDiscountAmount());
-            voucherDiscount.setSortOrder(1); // 券码显示顺序最高
+            voucherDiscount.setSortOrder(2); // 券码显示顺序低于限时立减
             voucherDiscount.setVoucherCode(voucherInfo.getVoucherCode());
             voucherDiscount.setCreateTime(now);