refactor: remove font-size utility file and replace with inline text classes

Delete the src/static/scss/font-size.scss utility file, and replace all legacy `font-size-*` class usages across the codebase with inline `text-[numberpx]` styling to consolidate font size definitions and remove redundant utility code.

src/pages-order/order/components/UserInfo/index.vue

@@ -1,12 +1,12 @@
 <template>
   <view class="bg-white rounded-[10px] p-[12px] mb-[12px]" v-if="hasConsumerData">
     <view v-for="(item, index) in consumerList" :key="index">
-      <view class="flex mb-[8px] font-size-12">
+      <view class="flex mb-[8px] text-[12px]">
         <text class="w-60 text-[#99a0ae]">住客姓名</text>
         <text class="text-[#525866]">{{ item.visitorName }}</text>
       </view>
     </view>
-    <view class="flex font-size-12">
+    <view class="flex text-[12px]">
       <text class="w-60 text-[#99a0ae]">联系电话</text>
       <text class="text-[#525866]">{{ contactPhone }}</text>
     </view>