fix(shop): 修复首页VIP价格显示及后端价格字段问题

- 首页index.tsx中接入useVipStatus，修复热销推荐价格未显示dealerPrice的问题
- 新增getHotDisplayPrice函数，VIP时显示dealerPrice及划线原价，并添加VIP金色角标
- 后端OrderCreateRequest.OrderGoodsItem增加price字段及校验，解决后端DTO缺失price字段问题
- 重构OrderBusinessService中价格校验逻辑，确保正确优先级及SKU库存校验
- 确认价格字段约定，前端传dealerPrice给后端下单
- Maven编译通过，后端需重启服务生效

src/pages/index/index.tsx

@@ -5,6 +5,7 @@ import { useUser } from '@/hooks/useUser'
 import { useShare } from '@/hooks/useShare'
 import { useScrollHeight } from '@/hooks/useScrollHeight'
 import { useNewOrderDetector } from '@/hooks/useNewOrderDetector'
+import { useVipStatus } from '@/hooks/useVipStatus'
 import { getMyClerk } from '@/api/shop/shopStoreUser'
 import { pageShopOrder } from '@/api/shop/shopOrder'
 import { listCmsAd } from '@/api/cms/cmsAd'
@@ -29,6 +30,8 @@ const IndexPage: React.FC = () => {
   const [hotProducts, setHotProducts] = useState<ShopGoods[]>([])
   const [loading, setLoading] = useState(true)
   const scrollHeight = useScrollHeight(44)
+  // VIP 状态：异步校验并更新缓存，isVip 变化时触发重渲染
+  const { isVip } = useVipStatus()
 
   // 首页分享：好友 + 朋友圈 + 复制链接（右上角三个按钮全亮）
   useShare({
@@ -165,6 +168,17 @@ const IndexPage: React.FC = () => {
     Taro.navigateTo({ url: '/pages/index/notification' })
   }
 
+  /**
+   * VIP 会员显示 dealerPrice（同时把 price 作为划线原价），非 VIP 维持原行为
+   */
+  const getHotDisplayPrice = (item: ShopGoods): { price: string; original?: string } => {
+    if (isVip && item.dealerPrice) {
+      return { price: item.dealerPrice, original: item.price }
+    }
+    const original = item.salePrice && item.salePrice !== item.price ? item.salePrice : undefined
+    return { price: item.price || '0', original }
+  }
+
   // tabBar 页面列表
   const tabBarPages = ['/pages/index/index', '/pages/shop/index', '/pages/order/list', '/pages/user/user']
 
@@ -330,11 +344,14 @@ const IndexPage: React.FC = () => {
                         <Text className='text-sm text-gray-700 truncate block'>{item.goodsName || item.name}</Text>
                         <View className='flex items-center mt-1'>
                             <Price
-                                price={item.price || '0'}
-                                original={item.salePrice && item.salePrice !== item.price ? item.salePrice : undefined}
+                                price={getHotDisplayPrice(item).price}
+                                original={getHotDisplayPrice(item).original}
                                 size='small'
                                 loginMask
                             />
+                            {isVip && item.dealerPrice ? (
+                              <Text className='text-xs text-amber-600 ml-1'>VIP</Text>
+                            ) : null}
                         </View>
                         {item.sales !== undefined && item.sales > 0 && (
                             <Text className='text-xs text-gray-400 mt-1'>已售 {item.sales}</Text>