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/treating/treating.wxml

@@ -1,8 +1,8 @@
 <view class="page">
   <view class="page-header page-header-blue" style="padding-top: {{statusBarHeight + 24}}px;">
     <view class="nav-back nav-back-light" bindtap="onBack">‹ 返回</view>
-    <view class="page-header-title">护理中</view>
-    <view class="page-header-subtitle">正在护理...</view>
+    <view class="page-header-title">使用中</view>
+    <view class="page-header-subtitle">正在使用...</view>
   </view>
 
   <view class="page-content">
@@ -23,10 +23,10 @@
       <text class="relax-icon">💆</text>
       <view class="relax-text">
         <text>请放松心情</text>
-        <text>享受护理时光</text>
+        <text>享受美好时光</text>
       </view>
     </view>
 
-    <button class="btn-primary btn-primary-red" bindtap="onStop">停止护理</button>
+    <button class="btn-primary btn-primary-red" bindtap="onStop">停止使用</button>
   </view>
 </view>