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/subscribe-plans/subscribe-plans.wxml

@@ -29,7 +29,7 @@
       <view class="service-icon">✨</view>
       <view class="service-info">
         <view class="service-name">智能模式</view>
-        <view class="service-desc">根据皮肤状态自动调节</view>
+        <view class="service-desc">智能自动调节</view>
       </view>
     </view>