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/profile/profile.wxml

@@ -40,7 +40,7 @@
       </view>
       <view class="menu-item" bindtap="onViewHistory">
         <view class="menu-icon">📋</view>
-        <view class="menu-text">护理记录</view>
+        <view class="menu-text">使用记录</view>
         <text class="menu-arrow">›</text>
       </view>
       <view class="menu-item" bindtap="onViewSubscription">