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/PayModal/index.tsx

@@ -11,7 +11,7 @@ interface PayModalProps {
 
 const PAY_TYPES = [
   { id: 1, name: '微信支付', desc: '推荐使用', icon: 'pay-wechat' },
-  { id: 0, name: '余额支付', desc: '使用账户余额', icon: 'pay-balance' },
+  { id: 0, name: '货到付款', desc: '使用账户余额', icon: 'pay-balance' },
 ]
 
 const PayModal: React.FC<PayModalProps> = ({ visible, amount, onClose, onConfirm }) => {
@@ -60,7 +60,7 @@ const PayModal: React.FC<PayModalProps> = ({ visible, amount, onClose, onConfirm
         <View className='p-4'>
           {/* 关闭按钮 */}
           <View className='flex justify-end mb-2'>
-            <View 
+            <View
               className='w-6 h-6 rounded-full bg-gray-100 flex items-center justify-center'
               onClick={handleClose}
             >