feat: production readiness — feature gaps + config hardening

Miniprogram:
- Add BLE reconnect button on home page when disconnected
- Add loading states to index, profile, subscribe-plans pages
- Add profile editing (avatar + nickname) with COS upload
- Enable pull-to-refresh on history page
- Fix auto-scan self.options → self.data inconsistency
- Add console.error to silent catch blocks
- Gate 'Simple Peripheral' BLE scan behind __DEV__ flag
- Add production config comment to env.js

Admin console:
- Add empty state '暂无数据' to all 5 list views
- Replace plain text plan input with select dropdown
- Add type="date" to record date filters
- Add production config comment

Server:
- CORS origin restricted in production (env CORS_ORIGIN)
- DB pool size configurable via DB_POOL_SIZE env var
- .env.example updated with WeChat Pay + production fields

miniprogram/pages/auto-scan/auto-scan.js

@@ -96,7 +96,7 @@ Page({
   onMockScanDone: function () {
     var self = this
     if (self._progressTimer) clearInterval(self._progressTimer)
-    var mask = parseInt(self.options.regions) || 0x7F
+    var mask = parseInt(self.data.regions) || 0x7F
     wx.redirectTo({
       url: '/pages/treating/treating?regions=' + mask +
         '&wavelength=2' +