Photo: Intelligencer; John Herman In less than a decade, Chinese e-commerce sites have remade American shopping. A recent analysis by Salesforce found that apps such as Temu, Shein, AliExpress, and TikTok “will account for one in five purchases over the holiday season.” For Amazon, the largest American online retailer, these competitors have gone from a marginal trend to a real threat. And so this week, Amazon is rolling out Haul, a new section — a storefront, really — to its hundreds of