单机模式查看集群状态异常，Group qrs has no containers, maybe lack of candidate nodes

[admin@ubuntu ~]$ hape gs havenask
{
"hint": "Group qrs has no containers, maybe lack of candidate nodes",
"leaderAddress": "http://192.168.1.3:45700",
"serviceZk": "zfs://192.168.1.3:2181/havenask/havenask-sql-local/appmaster",
"hippoZk": "zfs://192.168.1.3:2181/havenask/havenask-sql-local/hippo",
"clusterStatus": "NOT_READY",
"sqlClusterInfo": {
"admin": [],
"qrs": {},
"database": {}
}
}

Reproduce the single-node case with `hape gs havenask` and inspect how the command derives `clusterStatus` and the `qrs` container state from the reported serviceZk and hippoZk endpoints. Confirm the cause of the empty qrs group, then verify that the command reports the correct cluster status when the single-node setup is healthy.

Written by the indexing model from the issue text.