refactor: replace vps.* hostnames with server.t* across all scripts

Migrated all SSH host references from vps.git to server.t0 to use
the new unified HangmanLab server naming convention.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

keycloak-hangman-lab/scripts/kcadm

@@ -2,7 +2,7 @@
 set -euo pipefail
 # pcguard || exit 1
 
-REMOTE_HOST="vps.git"
+REMOTE_HOST="server.t0"
 REMOTE_USER="root"
 CONTAINER_NAME="git-kc-keycloak"
 HOST_CONFIG="/root/.keycloak/kcadm.config"