Step-by-step operator guide for upgrading a running deployment from the
working-copy bot to the prototype (env-var config, optional internal HTTP
auth, Conan Exiles bridge). Covers backup/rollback, new dependencies,
systemd EnvironmentFile wiring, verification, behaviour changes, and
opt-in feature toggles (API key, Conan, player-join notifications).
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>