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/auto-scan/auto-scan.wxml

@@ -15,7 +15,7 @@
     </view>
 
     <view class="scan-hint">请将面罩对准面部</view>
-    <view class="scan-hint" style="font-size:24rpx;color:#999;margin-top:8rpx;">连接设备后可获取皮肤数据</view>
+    <view class="scan-hint" style="font-size:24rpx;color:#999;margin-top:8rpx;">连接设备后可获取检测数据</view>
 
     <view class="scan-progress" wx:if="{{scanning}}">
       正在扫描... <text class="highlight">{{regionData.length || 3}}</text> 个区域
@@ -25,6 +25,6 @@
       <text class="detected-tag" wx:for="{{regionData}}" wx:key="region">{{item.region}}</text>
     </view>
 
-    <button class="btn-primary mt-30" wx:if="{{!scanning}}" bindtap="onNext">设置护理参数</button>
+    <button class="btn-primary mt-30" wx:if="{{!scanning}}" bindtap="onNext">设置参数</button>
   </view>
 </view>