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/ble-connect/ble-connect.wxml

@@ -18,7 +18,7 @@
 
     <view class="found-card" wx:if="{{state === 'binding'}}">
       <view class="found-icon">💆</view>
-      <view class="found-name">光子美容仪-{{deviceId}}</view>
+      <view class="found-name">智能面膜-{{deviceId}}</view>
       <text class="status-badge status-badge-green">正在配对...</text>
     </view>