fix: remove all medical device terms from user-facing text

Replace '光子美容仪' with '智美'/'智能面膜'/'我的设备' throughout.
Replace '护理' with '使用' in all UI text.
Replace '皮肤' with '检测'/'智能' where applicable.
Replace 🌸 with 💎 for brand identity.
Internal code (variable names, API paths, file names) unchanged.

miniprogram/pages/treatment-done/treatment-done.wxml

@@ -1,28 +1,28 @@
 <view class="page">
   <view class="page-header page-header-green" style="padding-top: {{statusBarHeight + 24}}px;">
     <view class="nav-back" bindtap="onBack">‹ 返回</view>
-    <view class="page-header-title">护理完成</view>
-    <view class="page-header-subtitle">本次护理已结束</view>
+    <view class="page-header-title">使用完成</view>
+    <view class="page-header-subtitle">本次使用已结束</view>
   </view>
 
   <view class="page-content">
     <view class="result-icon">✓</view>
-    <view class="result-title">护理完成！</view>
+    <view class="result-title">使用完成！</view>
 
     <view class="result-data">
       <view class="result-item">
         <view class="result-value">{{durationText}}</view>
-        <view class="result-label">护理时长</view>
+        <view class="result-label">使用时长</view>
       </view>
       <view class="result-item">
         <view class="result-value">{{regionNames.length}}</view>
-        <view class="result-label">护理区域</view>
+        <view class="result-label">使用区域</view>
       </view>
     </view>
 
     <view class="result-tip">
       <text class="result-tip-icon">✨</text>
-      <text class="result-tip-text">本次护理已记录</text>
+      <text class="result-tip-text">本次使用已记录</text>
     </view>
 
     <button class="btn-primary" bindtap="onBackHome">返回首页</button>