fix(SkuSelector): 修正价格显示逻辑避免价格错误

- 调整fakeSku中price字段优先使用product.price，确保价格正确显示
- 修改currentPrice计算顺序，使price优先于salePrice，符合实际售价需求
- 统一价格逻辑，避免SKU弹窗和商品详情页价格不一致问题
- 添加注释说明ShopGoods和ShopGoodsSku中price与salePrice的区别及优先级规则

src/components/business/SkuSelector/index.tsx

@@ -157,7 +157,7 @@ const SkuSelector: React.FC<SkuSelectorProps> = ({
         const fakeSku: ShopGoodsSku = {
           id: 0,
           goodsId: product.goodsId!,
-          price: product.salePrice || product.price,
+          price: product.price || product.salePrice,
           salePrice: product.salePrice || product.price,
           stock: product.stock,
           image: product.image,
@@ -187,7 +187,11 @@ const SkuSelector: React.FC<SkuSelectorProps> = ({
     }
   }
 
-  const currentPrice = selectedSku?.salePrice || selectedSku?.price || product?.salePrice || product?.price || '0'
+  // 价格优先级：SKU售价 > SKU原价 > 商品售价 > 商品原价 > 0
+  // 注意：ShopGoods 模型中 price=商品价格(低), salePrice=销售/市场价(高)
+  //       ShopGoodsSku 模型中 price=商品价格, salePrice=市场价格(高)
+  // 统一以 price 为准，salePrice 仅作兜底展示
+  const currentPrice = selectedSku?.price || selectedSku?.salePrice || product?.price || product?.salePrice || '0'
   const currentStock = selectedSku?.stock ?? product?.stock ?? 0
   const currentImage = selectedSku?.image || product?.image || (product?.files?.split(',')[0]) || ''