fix: 主包孤儿文件 api/order.ts 迁入分包（pingxiang-order），消除真机代码质量告警

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

src/packages/user/pages/buy.vue

@@ -50,7 +50,7 @@ import { onLoad, onShareAppMessage, onShareTimeline } from '@dcloudio/uni-app'
 import { post, getToken } from '../../../api/request'
 import { BASE_URL } from '../../../config'
 import { useUserStore } from '../../../store/user'
-import { createOrder, prepay } from '../../../api/order'
+import { createOrder, prepay } from '../api/pingxiang-order'
 import type { BannerItem } from '../../../api/types'
 
 const userStore = useUserStore()