Add WriteConfig/Prepare backend methods (real for Hyprland, no-op for
Sway), -apply/-prepare/-no-reload CLI flags, ExecStartPre cleanup and
suspend systemd hooks so a stale docked config can never leave the
built-in display disabled after resume.
Extract shared resolveMonitorNames to backend package so both
Hyprland and Sway backends resolve desc: prefixed names to actual
connector names before applying monitor layout.
Previously the Hyprland backend wrote desc:... literally into
monitors.conf, which Hyprland ignores, causing monitors to be
positioned incorrectly or not configured at all.
Maksim Totmin