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/utils/request/index.ts

@@ -2,8 +2,8 @@ import type { ApiResponse, HttpMethod, RequestOptions } from './types'
 
 export type { ApiResponse, RequestOptions }
 
-const BASE_URL = 'http://10.10.10.10:8889/'             // 测试环境
-// const BASE_URL = 'https://device.shuziweidao.com/gateway/'  // 正式环境
+// const BASE_URL = 'http://10.10.10.10:8889/'             // 测试环境
+const BASE_URL = 'https://device.shuziweidao.com/gateway/'  // 正式环境
 
 let _loadingCount = 0