Rewrite start-azeroth-servers.sh to launch auth/worldserver in named
tmux sessions instead of nohup/disown. Add kill-azeroth-servers.sh to
tear down sessions and stray processes. Update vps-update-server.sh
with a --restart flag that stops servers before compile and restarts
them in tmux after.
Co-authored-by: Cursor <cursoragent@cursor.com>
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