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>