Remove mid-session systemd-userdbd reload that broke SDDM/KDE lock
screen password verification. Add pre-conversion system analysis with
display manager detection and SDDM-specific warnings. Add --dry-run
to preview all actions, /etc/agelesslinux.conf to record what was
installed, and --revert to automatically undo a conversion. Back up
existing userdb records before modifying. Version 0.0.5.
Addresses #1
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>