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/pages/login/index.vue

@@ -1,8 +1,8 @@
 <template>
   <view class="login-page">
     <view class="login-card">
-      <view class="login-logo">🌸</view>
-      <view class="login-title">光子美容仪</view>
+      <view class="login-logo">💎</view>
+      <view class="login-title">智美</view>
       <view class="login-subtitle">管理后台</view>
 
       <view class="form-group">
@@ -32,7 +32,7 @@
         登 录
       </button>
 
-      <view class="login-footer">© 2026 光子美容仪管理后台</view>
+      <view class="login-footer">© 2026 智美管理后台</view>
     </view>
   </view>
 </template>