[AI Generated]: feat(device): 配网/绑定后下发主用户到设备并兜底超时

- configWifi 加 20s 超时与 settled 互锁，避免回调不触发导致 loading 死转
- supplementPersonal 提交后、connectedWifi 二次配网确认后均下发主用户
- 设备成员唯一标识从 idCard 切换为 userId，清理 MemberDisplay.idCard

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

miniprogram/lefu/service.ts

@@ -292,7 +292,16 @@ class LeFuService {
                 reject(new Error('[LeFu] 设备未连接，无法配网'))
                 return
             }
+            let settled = false
+            const timer = setTimeout(() => {
+                if (settled) return
+                settled = true
+                reject(new Error('[LeFu] 配网超时，请重试'))
+            }, 20000)
             const callback = (res: number) => {
+                if (settled) return
+                settled = true
+                clearTimeout(timer)
                 console.log(TAG, 'configWifi 回调:', res)
                 res === 23 ? resolve() : reject(new Error(`[LeFu] 配网失败，错误码：${res}`))
             }