Add Debian .deb package support
- debian/control, changelog, conffiles — package metadata
- debian/postinst — creates irc-bot system user, installs Python venv,
symlinks runtime dirs, enables systemd services
- debian/prerm/postrm — clean stop/uninstall with purge support
- debian/systemd/ — hardened systemd units for bot and portal
- build_deb.sh — assembles and builds the .deb via dpkg-deb
- Path resolver in irc_client.py, memory.py, config_manager.py, portal/app.py:
uses /etc/irc-bot + /var/lib/irc-bot when installed as .deb, relative
paths otherwise (Docker/venv unchanged)
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
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