fix(lefu): 完善蓝牙连接状态处理，修复断开后 UI 不同步问题

- connectState 回调增加 UNAVAILABLE 清理和 READY 自动重连
- disconnect() 增加 _intentionalConnect 标记避免误重连
- deviceWillDisconnect 增加 _activeProtocol 防重入判断
- connectedDevice/equipment/connectedWifi 增加断开状态响应
- connectedWifi 设备断开后自动退出配网页

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

miniprogram/app.json

@@ -32,7 +32,7 @@
   "lazyCodeLoading": "requiredComponents",
   "plugins": {
     "ppScale-plugin": {
-      "version": "0.0.25",
+      "version": "0.0.29",
       "provider": "wx0826af4e4908f524"
     }
   },