Records that no extra configuration is needed for remote use: the transport
already reaches 192.168.10.20 over Tailscale via the subnet router, which is
the same path used from VLAN 20 at home.
Adds a fallback to Tailscale SSH on 100.100.208.69 for the case where the
mikrotik-tailscale container dies while Unraid stays up. The target is chosen
by a TCP probe before any ssh starts, since a failed first attempt would
consume stdin and corrupt the retry.
Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>