feat(debug): temporary BLE debug page for on-device verification

- entry in profile menu, visible only while a device is connected
- live FFE4 readout: 7x PD, VBAT, fitting, scan wave marker, run state
- tap a face-map region to fire a 2s single-region treat command
  (verifies region-to-IO mapping on the physical mask)
- wavelength selector (red/ir/uv/yellow) to verify color byte order
- scan command / full-face 2s / stop buttons, hex log of every write
- intentionally not i18n'd; remove page before release

miniprogram/pages/ble-debug/ble-debug.wxml

@@ -0,0 +1,65 @@
+<!-- 临时调试页：真机联调用（区域/波长/极性/分桶验证），上线前移除，不走 i18n -->
+<view class="page">
+  <view class="page-header page-header-gradient" style="padding-top: {{statusBarHeight + 8}}px;">
+    <view class="nav-back nav-back-light" bindtap="onBack">‹ 返回</view>
+    <view class="page-header-title">调试工具（临时）</view>
+    <view class="page-header-subtitle">{{connected ? '设备已连接' : '设备未连接'}}</view>
+  </view>
+
+  <view class="page-content">
+    <!-- 实时状态 -->
+    <view class="card">
+      <view class="card-title">FFE4 实时状态 <text class="frames">({{frames}} 帧)</text></view>
+      <view class="pd-row">
+        <view class="pd-cell" wx:for="{{pd}}" wx:key="*this">
+          <view class="pd-idx">PD{{index + 1}}</view>
+          <view class="pd-val">{{item}}</view>
+        </view>
+      </view>
+      <view class="status-row">
+        <text>VBAT {{vbat}}mV ({{battery}}%)</text>
+        <text>贴合 {{fitting}}</text>
+        <text>光色 {{scanWave}}</text>
+        <text>状态 {{runState}}</text>
+      </view>
+    </view>
+
+    <!-- 波长选择 -->
+    <view class="card">
+      <view class="card-title">波长（点分区/全脸时使用）</view>
+      <view class="wave-row">
+        <view class="wave-chip {{selectedWave === item.key ? 'active' : ''}}" wx:for="{{waves}}" wx:key="key"
+          bindtap="onSelectWave" data-key="{{item.key}}">{{item.label}}</view>
+      </view>
+    </view>
+
+    <!-- 脸型图：点区发 2 秒治疗 -->
+    <view class="card">
+      <view class="card-title">点分区 → 该区 2 秒治疗（对物理位置）</view>
+      <view class="face-map">
+        <view class="face-region forehead" bindtap="onTapRegion" data-mask="2">中上\nIO2</view>
+        <view class="face-region left-cheek" bindtap="onTapRegion" data-mask="1">左\nIO1</view>
+        <view class="face-region right-cheek" bindtap="onTapRegion" data-mask="16">右\nIO5</view>
+        <view class="face-region nose" bindtap="onTapRegion" data-mask="4">中\nIO3</view>
+        <view class="face-region chin" bindtap="onTapRegion" data-mask="8">中下\nIO4</view>
+      </view>
+    </view>
+
+    <!-- 指令按钮 -->
+    <view class="card">
+      <view class="card-title">指令</view>
+      <view class="btn-row">
+        <button class="dbg-btn" bindtap="onScanCmd">检测指令</button>
+        <button class="dbg-btn" bindtap="onTreatAll">全脸 2s</button>
+        <button class="dbg-btn dbg-btn-stop" bindtap="onStop">停止</button>
+      </view>
+    </view>
+
+    <!-- 日志 -->
+    <view class="card">
+      <view class="card-title">发送日志 <text class="log-clear" bindtap="onClearLog">清空</text></view>
+      <view class="log-line" wx:for="{{logs}}" wx:key="*this">{{item}}</view>
+      <view class="log-empty" wx:if="{{logs.length === 0}}">暂无</view>
+    </view>
+  </view>
+</view>