xint-installation-layout-versioned-releases-with-symlink

xint follows the VPS infra versioned-release pattern: /opt/infra/xint/releases/<version>/ contains the actual install, /opt/infra/xint/current/ is a symlink to the active release, /usr/local/bin/xint is a global Bun launcher script, and /opt/infra/xint/.env holds credentials at chmod 600. The persistent data directory at /opt/infra/xint/data/ must be symlinked into each release immediately after install.