refactor: replace flex-full with flex-1 and standardize scrollbar styles

- replace all outdated flex-full utility classes with modern flex-1 across Vue components
- standardize scrollbar hiding by using scrollbar-none utility instead of verbose vendor prefixes
- update order detail page layout and scroll container styling
- add scrollbar-none usage guidelines to AGENTS.md documentation

src/pages/booking/components/ConactSection/index.vue

@@ -1,7 +1,7 @@
 <template>
   <!-- 选择数量 -->
   <div class=" bg-white p-[12px] rounded-[12px] flex flex-items-center mb-[12px]">
-    <div class="flex-full">
+    <div class="flex-1">
       <div class="text-[16px] font-medium text-black leading-[24px]">选择数量</div>
       <div class="text-[12px] color-A3A3A3 leading-[16px]">请选择套餐数量</div>
     </div>