feat(ui): redesign all miniprogram pages

- 全局样式改为粉色(#E6508C)/金色(#DCB982)/绿色(#52c41a)配色
- 所有非tab页使用自定义导航栏，带彩色头部+标题+副标题
- login页: 粉色头部+🌸图标+微信授权登录
- scan页: 粉色头部+虚线扫码框+手动输入按钮
- ble-connect页: 蓝牙提示+搜索中/已发现设备卡片
- bind-success页: 绿色头部+成功图标+7天试用提示卡
- wear-check页: 设备信息行+佩戴指引卡片
- index首页: 粉色设备卡片+开始护理/设备管理按钮
- treatment-setup页: 模式选择+面部地图选区域
- auto-scan页: 面部轮廓+扫描线动画+检测标签
- treating页: 蓝色头部+大倒计时+渐变进度条+放松提示
- treatment-done页: 绿色头部+统计卡片+已记录提示
- subscribe-prompt页: 普通/智能模式对比+试用提示+金色订阅按钮
- subscribe-plans页: 金色头部+服务卡片+月卡/年卡选择
- subscribe-success页: 绿色头部+订阅详情卡+金色按钮
- profile页: 渐变头部+用户行+订阅卡+菜单列表
- history页: 粉色统计行+模式标签记录列表

miniprogram/pages/index/index.wxml

@@ -1,52 +1,30 @@
-<view class="container">
-  <view class="card device-card" wx:if="{{!hasDevice}}">
-    <view class="text-center">
-      <view class="section-title">添加设备</view>
-      <view class="text-muted mb-30">您还没有绑定设备</view>
-      <view class="btn-primary" bindtap="onAddDevice">扫码添加设备</view>
+<view class="page">
+  <view class="page-header page-header-pink">
+    <view class="page-header-title">首页</view>
+    <view class="page-header-subtitle">光子美容仪</view>
+  </view>
+
+  <view class="page-content" wx:if="{{!hasDevice}}">
+    <view class="empty-device">
+      <text class="empty-icon">📱</text>
+      <view class="empty-text">还没有绑定设备</view>
+      <button class="btn-primary mt-30" bindtap="onAddDevice">扫码添加设备</button>
     </view>
   </view>
 
-  <view class="card device-card" wx:if="{{hasDevice}}">
-    <view class="flex-between mb-20">
-      <view>
-        <view class="device-name">{{deviceName}}</view>
-        <view class="device-status">
-          <text class="{{connected ? 'text-success' : 'text-muted'}}">
-            {{connected ? '已连接' : bleState === 'scanning' ? '扫描中...' : bleState === 'connecting' ? '连接中...' : '未连接'}}
-          </text>
-        </view>
-      </view>
-      <view wx:if="{{connected}}" class="battery-area">
-        <text>{{battery}}%</text>
+  <view class="page-content" wx:if="{{hasDevice}}">
+    <view class="device-card">
+      <view class="device-icon">💆</view>
+      <view class="device-name">{{deviceName || '我的光面膜'}}</view>
+      <text class="status-badge status-badge-green" wx:if="{{connected}}">已连接</text>
+      <text class="status-badge" style="background:#ccc;" wx:else>未连接</text>
+      <view class="device-battery" wx:if="{{connected}}">
+        <text>🔋</text>
+        <text>电量 {{battery}}%</text>
       </view>
     </view>
 
-    <view wx:if="{{!connected && bleState !== 'scanning' && bleState !== 'connecting'}}" class="mt-20">
-      <view class="btn-secondary" bindtap="onConnectBle">连接设备</view>
-    </view>
-
-    <view wx:if="{{connected}}" class="mt-20">
-      <view class="text-muted">设备状态: {{modeState}}</view>
-    </view>
-  </view>
-
-  <view class="card sub-card" bindtap="onViewSubscription">
-    <view class="flex-between">
-      <view>
-        <view class="section-title">订阅状态</view>
-        <view class="text-muted">
-          <block wx:if="{{subscription && subscription.status > 0}}">
-            {{subscription.status === 1 ? '试用中' : '已订阅'}} · 剩余 {{subRemaining}} 天
-          </block>
-          <block wx:else>未订阅</block>
-        </view>
-      </view>
-      <text class="arrow">&#10095;</text>
-    </view>
-  </view>
-
-  <view class="card" wx:if="{{connected && subscription && subscription.status > 0}}">
-    <view class="btn-primary text-center" bindtap="onStartTreatment">开始护理</view>
+    <button class="btn-primary" bindtap="onStartTreatment">开始护理</button>
+    <button class="btn-secondary" bindtap="onAddDevice">设备管理</button>
   </view>
 </view>