refactor: replace legacy flex utility classes and remove flex.scss

Replace all instances of prefixed flex utility classes (like flex-items-center, flex-justify-between, flex-full, flex-shrink-0) with their standard un-prefixed counterparts (items-center, justify-between, flex-1, shrink-0) across the codebase. Remove the deprecated src/static/scss/flex.scss partial file as it is no longer needed after these updates.

src/pages/goods/components/GoodFacility/index.vue

@@ -5,7 +5,7 @@
       <view class="flex flex-items-start flex-col" :class="{
         'border-bottom': index < goodsData.commodityEquipment.length - 1,
       }">
-        <view class="flex flex-items-center flex-row flex-shrink-0">
+        <view class="flex items-center flex-row shrink-0">
           <uni-icons fontFamily="znicons" size="20" color="#171717">
             {{ zniconsMap[moduleItem.icon] }}
           </uni-icons>

src/pages/goods/index.vue

@@ -35,11 +35,11 @@
 
     <!-- 立即抢购 -->
     <view class="footer border-top">
-      <view class="amt text-[20px] font-bold text-[#ff3d60] line-height-28 flex flex-items-center mr-[8px]">
+      <view class="amt text-[20px] font-bold text-[#ff3d60] line-height-28 flex items-center mr-[8px]">
         {{ calculatedTotalPrice }}
       </view>
 
-      <view class="btn rounded-[10px] flex flex-items-center ml-auto pl-[8px]" @click="navigateToPay(goodsData)">
+      <view class="btn rounded-[10px] flex items-center ml-auto pl-[8px]" @click="navigateToPay(goodsData)">
         <image class="icon" src="https://oss.nianxx.cn/mp/static/version_101/common/btn.png" />
         <text class="text-[16px] font-[500] text-white">立即预定</text>
       </view>