fix: 修复轮询停机连坐、实名逆转防抖及carrier_stopped原因写入缺失三个逻辑缺陷

internal/task/polling_cardstatus_handler.go

@@ -97,6 +97,10 @@ func (h *PollingCardStatusHandler) Handle(ctx context.Context, t *asynq.Task) er
 	fields := map[string]any{"last_card_status_check_at": now}
 	if statusChanged {
 		fields["network_status"] = newNetworkStatus
+		// 网关侧停机事件：补写 stop_reason，便于状态追踪和区分手动停机
+		if newNetworkStatus == constants.NetworkStatusOffline && card.StopReason == "" {
+			fields["stop_reason"] = constants.StopReasonCarrierStopped
+		}
 	}
 	if updateErr := h.iotCardStore.UpdateFields(ctx, cardID, fields); updateErr != nil {
 		h.base.logger.Warn("更新卡状态信息失败", zap.Uint("card_id", cardID), zap.Error(updateErr))