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/ChatModule/CallMobile/index.vue

@@ -2,12 +2,12 @@
   <uni-popup ref="popup" type="center" :safe-area="false">
     <view class="popup-content bg-white mx-[24px] px-[12px] py-16 rounded-[12px]">
       <view class="header flex flex-items-center pb-[12px]">
-        <view class="title flex-full text-center font-size-17 text-[#000000] font-[500] ml-[24px]">呼叫热线</view>
+        <view class="title flex-full text-center text-[17px] text-[#000000] font-[500] ml-[24px]">呼叫热线</view>
         <uni-icons type="close" size="24" color="#CACFD8" @click="close" />
       </view>
 
       <view class="border-box pl-[12px] pr-[12px]">
-        <view class="font-size-16 text-[#a3a3a3] leading-[22px]">
+        <view class="text-[16px] text-[#a3a3a3] leading-[22px]">
           如有任何疑问，欢迎随时致电景区咨询热线：
           <text class="text-[#2563eb]" @click="handleClick(mobleNumber1)">{{ mobleNumber1 }}</text> / <text
             class="text-[#2563eb]" @click="handleClick(mobleNumber2)">{{ mobleNumber2 }}</text>，