Scrape one 1688.com offer's full detail

Fetches one 1688.com offer (by offer_id or url) and returns it as JSON: title, status, brand, category, prices in yuan (currency CNY: priceText, priceMin/priceMax), pricing (tiers when every SKU is priced by the quantity ladder priceTiers, sku when each SKU carries its own price), originalPriceTiers (before a promotion), unit, moq (minimum order), available (stock), sold + soldText + soldPeriod, variantOptions (option names and values with images) and variants (every SKU with skuId, options, price, available), attributes, images, video, descriptionUrl, shipping (from, dispatch promise, unitWeightKg, freeShipping), services (guarantees), labels, rating (goodRatePercent, score, reviewCount, reviewsWithPhotos, review tags), favorites and the supplier (name, loginId, memberId, userId, shopUrl, serviceScore, repeatPurchaseRate3m, factory, tpMember, location). Text is returned in Chinese as 1688 publishes it. Companion to /marketplace/1688-search.