chore(vars): commit clan vars SSH host key for lxc-tor-relay

The key was generated in a prior session but not committed — the clan vars
files existed only in that session's working tree. Recovered the original
private key from pve1's host-keys/ backup (fingerprint age16kqf... matches
the &lxc-tor-relay anchor already in .sops.yaml), re-encrypted for admin
age key only, and stored in the canonical clan vars layout.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01B2EJ4qTsM5KUqhS5c3GAwx

vars/per-machine/lxc-tor-relay/openssh/ssh_host_ed25519_key.pub/value

@@ -0,0 +1 @@
+ssh-ed25519 AAAAC3NzaC1lZDI1NTE5AAAAIOAzES7wlgL7gIyxOHbmwhzI8SJ5uMSEd26u+ek6knVh lxc-tor-relay