feat：允许0

coolstore-partner-service/src/main/java/com/cool/store/service/order/impl/MiniStoreOrderServiceImpl.java

@@ -231,7 +231,7 @@ public class MiniStoreOrderServiceImpl implements MiniStoreOrderService {
                 if (quantity == null) {
                     quantity = binding.getDefaultQuantity();
                 }
-                if (quantity == null || quantity.compareTo(BigDecimal.ZERO) <= 0) {
+                if (quantity == null || quantity.compareTo(BigDecimal.ZERO) < 0) {
                     throw new ServiceException(ErrorCodeEnum.THE_QUANTITY_MUST_BE_GREATER_THAN_0);
                 }