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/lefu/service.ts

@@ -168,6 +168,7 @@ class LeFuService {
 			this._onConnectStateCb?.(res)
 			if (res === plugin.BLUE_STATE.CONNECTSUCCESS) {
 				this._startKeepAlive()
+				return
 			}
 			if (res === plugin.BLUE_STATE.CONNECTFAILED) {
 				this._stopKeepAlive()
@@ -176,6 +177,28 @@ class LeFuService {
 				} else {
 					this._doReconnect()
 				}
+				return
+			}
+			// 蓝牙不可用：做完整清理
+			if (res === plugin.BLUE_STATE.UNAVAILABLE) {
+				this._stopKeepAlive()
+				this._stopReconnectTimer()
+				if (this._activeProtocol) {
+					this._activeProtocol = null
+					this._onDisconnectedCb?.()
+				}
+				return
+			}
+			// 蓝牙就绪：如有缓存设备且非主动断开，尝试连接
+			if (res === plugin.BLUE_STATE.READY) {
+				if (this._intentionalConnect) {
+					this._intentionalConnect = false
+				} else if (this._lastRawDevice && !this._activeProtocol) {
+					this._stopReconnectTimer()
+					wx.openBluetoothAdapter({
+						success: () => this.connect(this._lastRawDevice!),
+					})
+				}
 			}
 		})
 
@@ -189,9 +212,11 @@ class LeFuService {
 
 		plugin.bus.subscribe('deviceWillDisconnect', () => {
 			console.warn(TAG, 'bus[deviceWillDisconnect]，intentionalConnect:', this._intentionalConnect)
-			this._activeProtocol = null
 			this._stopKeepAlive()
-			this._onDisconnectedCb?.()
+			if (this._activeProtocol) {
+				this._activeProtocol = null
+				this._onDisconnectedCb?.()
+			}
 			if (!this._intentionalConnect) {
 				this._doReconnect()
 			}
@@ -221,6 +246,7 @@ class LeFuService {
 
 	disconnect(): void {
 		console.log(TAG, 'disconnect()')
+		this._intentionalConnect = true
 		this._stopKeepAlive()
 		plugin.Blue.disconnect()
 	}