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,

miniprogram/pages/connectedDevice/connectedDevice.ts

@@ -28,6 +28,11 @@ Page({
 
     onShow() {
         console.log(TAG, 'onShow')
+        // 回到页面时同步实际连接状态，避免回调被其他页面覆盖导致状态不同步
+        if (!lefuService.isConnected) {
+            const list = this.data.deviceList.map(item => ({ ...item, connected: false }))
+            this.setData({ deviceList: list })
+        }
     },
 
     onHide() {
@@ -169,6 +174,10 @@ Page({
             this.setData({ _autoConnectTried: true })
             this._autoConnectByIndex(matchedIndex)
         })
+        lefuService.onDisconnected(() => {
+            const list = this.data.deviceList.map(item => ({ ...item, connected: false }))
+            this.setData({ deviceList: list })
+        })
         lefuService.startScan()
         console.log(TAG, 'lefuService.startScan() 已调用')
     },

miniprogram/pages/connectedWifi/connectedWifi.ts

@@ -25,7 +25,7 @@ Page({
     _toBleStatus(state: string): BleStatus {
         const bs = lefuService.BLUE_STATE
         if (state === bs.CONNECTSUCCESS || state === bs.WIFISUCCESS) return 'connected'
-        if (state === bs.CONNECTFAILED) return 'failed'
+        if (state === bs.CONNECTFAILED || state === bs.UNAVAILABLE) return 'failed'
         return 'connecting'
     },
 
@@ -34,6 +34,11 @@ Page({
         lefuService.onDeviceInfo((info) => {
             this.setData({ deviceName: info.modelNumber })
         })
+        // 设备断开即退出配网页
+        lefuService.onDisconnected(() => {
+            wx.showToast({ title: '设备已断开连接', icon: 'none', duration: 1500 })
+            setTimeout(() => wx.navigateBack(), 1500)
+        })
         this.setData({
             bleStatus: this._toBleStatus(lefuService.connectState),
             deviceName: lefuService.deviceInfo?.modelNumber ?? '智能体重秤',
@@ -43,15 +48,13 @@ Page({
 
     onShow() {
         lefuService.onConnectState((state) => {
-            const bs = lefuService.BLUE_STATE
-            if (state === bs.CONNECTSUCCESS || state === bs.WIFISUCCESS || state === bs.CONNECTFAILED) {
-                this.setData({ bleStatus: this._toBleStatus(state) })
-            }
+            this.setData({ bleStatus: this._toBleStatus(state) })
         })
     },
 
     onUnload() {
         wx.hideLoading()
+        lefuService.onDisconnected(() => {})
         if (this.data.status === 'configuring') {
             lefuService.disconnect()
         }

miniprogram/pages/equipment/equipment.ts

@@ -68,6 +68,7 @@ Page({
         lefuService.stopScan()
         lefuService.onDeviceConnect(() => {})
         lefuService.onDeviceInfo(() => {})
+        lefuService.onDisconnected(() => {})
     },
 
     /** 拉取已绑定设备列表，加载完成后检查缓存自动连接 */
@@ -112,6 +113,9 @@ Page({
         lefuService.onDeviceInfo((info) => {
             this._markConnected(info.serialNumber as string)
         })
+        lefuService.onDisconnected(() => {
+            this._markAllDisconnected()
+        })
         lefuService.autoConnect()
     },
 
@@ -124,6 +128,12 @@ Page({
         this.setData({ deviceList: list })
     },
 
+    /** 将所有设备标记为未连接 */
+    _markAllDisconnected() {
+        const list = this.data.deviceList.map(item => ({ ...item, connected: false }))
+        this.setData({ deviceList: list })
+    },
+
     /** 点击「连接」：扫描周边设备，找到 deviceId 匹配的设备后连接 */
     onTapConnect(e: WechatMiniprogram.TouchEvent) {
         const userInfo = e.currentTarget.dataset.userInfo as DeviceItem