fix(mapping): correct region↔IO mapping per on-device measurement

Measured on real hardware: IO1=right IO2=left IO3=top IO4=middle IO5=bottom
(0x01=right 0x02=left 0x04=top 0x08=middle 0x10=bottom). The earlier verbal
'left=IO1/upper=IO2...' spec was wrong; this reverts to the original Phase-1
mapping, which the measurement confirms.

- protocol.js REGION constants + getRegionName + REGION_NAMES
- CRITICAL: buildVendorCommand ioMasks was built from REGION.* constants whose
  values just flipped, scrambling IO slot order; pin to literal [0x01..0x10]
- diagnosis.js REGION_DEFS key↔mask; pd_region_map values unchanged (PD is
  keyed by orientation, which is stable) — right=PD5 left=PD1 top=PD2
  middle=PD3,6,7 bottom=PD4
- common.js region labels back to right/left/top/middle/bottom (上/中/下)
- treatment-setup / manual-treatment / treating / scan-report / ble-debug
  face-map bindings and REGION_MAP realigned
- verified: mock pipeline lands left→IO2, middle→IO4 correctly

miniprogram/pages/scan-report/scan-report.wxml

@@ -35,26 +35,26 @@
       <view class="card-title">{{i18n.report.faceTitle}}</view>
       <!-- 脸型图（与「使用设置」同款布局）；位置↔faceZones 下标：1=中上 0=左 4=右 2=中 3=中下 -->
       <view class="face-map">
-        <view class="face-region forehead {{faceZones[1].colorClass}}" bindtap="onTapZone" data-wave="{{faceZones[1].waveKey}}">
-          <view class="fz-name">{{faceZones[1].name}}</view>
-          <view class="fz-mode" wx:if="{{faceZones[1].hasProblem}}">{{faceZones[1].modeLabel}}</view>
-        </view>
-        <view class="face-region left-cheek {{faceZones[0].colorClass}}" bindtap="onTapZone" data-wave="{{faceZones[0].waveKey}}">
-          <view class="fz-name">{{faceZones[0].name}}</view>
-          <view class="fz-mode" wx:if="{{faceZones[0].hasProblem}}">{{faceZones[0].modeLabel}}</view>
-        </view>
-        <view class="face-region right-cheek {{faceZones[4].colorClass}}" bindtap="onTapZone" data-wave="{{faceZones[4].waveKey}}">
-          <view class="fz-name">{{faceZones[4].name}}</view>
-          <view class="fz-mode" wx:if="{{faceZones[4].hasProblem}}">{{faceZones[4].modeLabel}}</view>
-        </view>
-        <view class="face-region nose {{faceZones[2].colorClass}}" bindtap="onTapZone" data-wave="{{faceZones[2].waveKey}}">
+        <view class="face-region forehead {{faceZones[2].colorClass}}" bindtap="onTapZone" data-wave="{{faceZones[2].waveKey}}">
           <view class="fz-name">{{faceZones[2].name}}</view>
           <view class="fz-mode" wx:if="{{faceZones[2].hasProblem}}">{{faceZones[2].modeLabel}}</view>
         </view>
-        <view class="face-region chin {{faceZones[3].colorClass}}" bindtap="onTapZone" data-wave="{{faceZones[3].waveKey}}">
+        <view class="face-region left-cheek {{faceZones[1].colorClass}}" bindtap="onTapZone" data-wave="{{faceZones[1].waveKey}}">
+          <view class="fz-name">{{faceZones[1].name}}</view>
+          <view class="fz-mode" wx:if="{{faceZones[1].hasProblem}}">{{faceZones[1].modeLabel}}</view>
+        </view>
+        <view class="face-region right-cheek {{faceZones[0].colorClass}}" bindtap="onTapZone" data-wave="{{faceZones[0].waveKey}}">
+          <view class="fz-name">{{faceZones[0].name}}</view>
+          <view class="fz-mode" wx:if="{{faceZones[0].hasProblem}}">{{faceZones[0].modeLabel}}</view>
+        </view>
+        <view class="face-region nose {{faceZones[3].colorClass}}" bindtap="onTapZone" data-wave="{{faceZones[3].waveKey}}">
           <view class="fz-name">{{faceZones[3].name}}</view>
           <view class="fz-mode" wx:if="{{faceZones[3].hasProblem}}">{{faceZones[3].modeLabel}}</view>
         </view>
+        <view class="face-region chin {{faceZones[4].colorClass}}" bindtap="onTapZone" data-wave="{{faceZones[4].waveKey}}">
+          <view class="fz-name">{{faceZones[4].name}}</view>
+          <view class="fz-mode" wx:if="{{faceZones[4].hasProblem}}">{{faceZones[4].modeLabel}}</view>
+        </view>
       </view>
       <!-- 底部图例：各光简要功效（果果指定保留） -->
       <view class="face-legend">