style: replace legacy padding classes with inline pixel values

Remove the unused padding.scss stylesheet and its import from the main SCSS entrypoint. Update all legacy padding utility class names across every Vue component to use inline pixel-based utility classes (such as replacing `pl-12` with `pl-[12px]`). Also clean up extraneous whitespace and line breaks in component templates for improved readability.

src/components/TopNavBar/index.vue

@@ -4,7 +4,7 @@
     <view :style="{ height: statusBarHeight + 'px' }" v-if="!hideStatusBar"></view>
 
     <!-- 导航栏内容 -->
-    <view class="flex flex-items-center flex-justify-between border-box pl-8 pr-8" :style="navContentStyle">
+    <view class="flex flex-items-center flex-justify-between border-box pl-[8px] pr-[8px]" :style="navContentStyle">
       <!-- 左侧返回按钮 -->
       <view class="nav-bar-left flex flex-items-center flex-justify-center" v-if="showBack" @click="handleBack">
         <uni-icons type="left" size="20" :color="backIconColor" />