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.

admin-console/src/views/UserDetailView.vue

@@ -26,7 +26,7 @@
       <view class="stats-row">
         <view class="stat-item pink-bg">
           <text class="stat-value">{{ user.treatment_count || 0 }}</text>
-          <text class="stat-label">护理次数</text>
+          <text class="stat-label">使用次数</text>
         </view>
         <view class="stat-item">
           <text class="stat-value">{{ user.total_duration ? Math.round(user.total_duration / 3600000) + 'h' : '0h' }}</text>
@@ -89,7 +89,7 @@
     </view>
 
     <view class="page-card" v-if="user && user.recent_treatments">
-      <view class="card-title">护理记录</view>
+      <view class="card-title">使用记录</view>
       <view class="data-table">
         <view class="t-header">
           <view class="t-row">