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/pages/addMember/addMember.ts

@@ -326,7 +326,7 @@ Page({
 
 		get<any>('weighingScale/v3/getUserInfoByIdcard', {
 			sn: lefuService.deviceInfo?.serialNumber ?? '',
-			idCard,
+			idCard: idCard || null,
 			realname: name
 		}, { loading: true })
 			.then(res => {
@@ -491,7 +491,7 @@ Page({
 			sn: lefuService.deviceInfo?.serialNumber ?? '',
 			scaleDeviceId: lefuService.deviceInfo?.serialNumber ?? '',
 			realname: name.trim(),
-			idCard,
+			idCard: idCard || null,
 			sex: finalSex,
 			birthday,
 			height: heightNum,