fix: replace facial/medical terms with neutral position labels

Region names: 左脸→左区, 右脸→右区, 额头→上区, 下巴→下区,
鼻唇→中区, 左眼→左上区, 右眼→右上区, 全脸→全区域.
Replace 面部/面罩 with 设备 in wear-check and auto-scan pages.

miniprogram/pages/wear-check/wear-check.wxml

@@ -2,7 +2,7 @@
   <view class="page-header page-header-pink" style="padding-top: {{statusBarHeight + 24}}px;">
     <view class="nav-back" bindtap="onBack">‹ 返回</view>
     <view class="page-header-title">确认佩戴</view>
-    <view class="page-header-subtitle">请确保面罩贴合面部</view>
+    <view class="page-header-subtitle">请确保设备正确佩戴</view>
   </view>
 
   <view class="page-content">
@@ -20,10 +20,10 @@
 
     <view class="guide-card">
       <view class="guide-title">佩戴指引</view>
-      <view class="guide-img">面罩佩戴示意图</view>
+      <view class="guide-img">设备佩戴示意图</view>
       <view class="guide-steps">
-        <view class="guide-step">1. 取出面罩，展开弹性绑带</view>
-        <view class="guide-step">2. 将面罩贴合面部</view>
+        <view class="guide-step">1. 取出设备，展开弹性绑带</view>
+        <view class="guide-step">2. 将设备正确佩戴</view>
         <view class="guide-step">3. 调节绑带至舒适位置</view>
       </view>
     </view>