refactor: remove custom font-weight scss and update class usages

Delete the standalone font-weight.scss utility file, remove its import from the main scss index, and update all existing references to the custom font-{weight} classes to use either built-in semantic font utilities or inline functional font weight classes matching the project's utility-first styling pattern.

src/pages-booking/components/UserSection/index.vue

@@ -1,7 +1,7 @@
 <template>
   <view class="bg-white rounded-[12px] overflow-hidden mb-[12px]">
     <view class="flex flex-items-center p-[12px] border-bottom">
-      <view class="font-size-16 font-500 text-[#000000] leading-[24px] flex-full">入住信息</view>
+      <view class="font-size-16 font-[500] text-[#000000] leading-[24px] flex-full">入住信息</view>
       <view class="right">
         <Stepper v-model="count" unit="间" />
       </view>
@@ -10,7 +10,7 @@
     <view class="border-box pl-[12px] pr-[12px]">
       <view class="border-box border-bottom pt-[12px] pb-[12px] flex flex-items-center"
         v-for="(item, index) in userFormList" :key="index">
-        <view class="font-size-14 font-500 text-[#525866] mr-[12px]"> 住客姓名 </view>
+        <view class="font-size-14 font-[500] text-[#525866] mr-[12px]"> 住客姓名 </view>
         <view class="right">
           <input class="border-box px-[4px] py-[2px] font-size-15 text-[#000000] leading-[20px]"
             v-model.trim="item.visitorName" placeholder="请输入姓名" maxlength="11" />
@@ -18,7 +18,7 @@
       </view>
 
       <view class="flex flex-items-center pt-[12px] pb-[12px]">
-        <view class="font-size-14 font-500 text-[#525866] mr-[12px]"> 联系手机 </view>
+        <view class="font-size-14 font-[500] text-[#525866] mr-[12px]"> 联系手机 </view>
         <view class="right">
           <input class="border-box px-[4px] py-[2px] font-size-15 text-[#000000] leading-[20px]"
             v-model.trim="userFormList[0].contactPhone" placeholder="请输入联系手机" maxlength="11" />