refactor: update env configs, replace uni-ui and fix issues

- add VITE_CLIENT_ID environment variable to all .env files, adjust API and socket URLs across dev/staging/prod environments
- update request utility to use env var for client ID instead of hardcoded "6"
- refactor GoodDetail component: replace uni-icons with van-icon, switch markdown renderer to vue3-markdown-it
- refactor Calendar component: swap uni-popup for van-popup, remove deprecated SCSS styles, update markup and toast calls
- fix ImageSwiper: rename handler methods, update preview navigation to use vue router, remove redundant code
- correct margin class syntax in goods index page

src/pages/goods/index.vue

@@ -4,7 +4,7 @@
     <div class="flex-1 overflow-y-auto" @scroll="handleScroll">
       <ImageSwiper :border-radius="0" :height="300" :images="goodsData.commodityPhotoList" thumbnailBottom="42px" />
 
-      <div class="bg-white py-[20px] relative -mt-[30px] z-10 rounded-t-[28px]">
+      <div class="bg-white py-[20px] relative mt-[-30px] z-10 rounded-t-[28px]">
         <!-- 商品信息组件 -->
         <GoodInfo :goodsData="goodsData" />