BatchMode=yes (which the scripts set) implies strict host key checking
and refuses to prompt — so first-time SSH to a host that isn't in
known_hosts fails with "Host key verification failed". Every new host
we register needs a manual `ssh <host>` round-trip first to store the
key before the refresh scripts can reach it.
accept-new fixes that: unknown hosts are auto-accepted into
known_hosts on first connect; subsequent key CHANGES still fail loudly
(as they should — that'd be a MITM signal).
Matches the pattern already used by deploy-stack.sh.
Affects only refresh-server-info.sh and refresh-proxmox-info.sh;
deploy-stack.sh + sync-stacks.sh use their own targets that may or may
not want the same treatment (leaving alone for now).
vh
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