Make setup ISO-only

Remove legacy online installer entrypoints, collapse migrations for 4.0, and move setup responsibilities into target-side system, hardware, and user commands.

config/systemd/user/omarchy-sleep-lock.service

@@ -5,7 +5,7 @@ Requires=dbus.socket
 
 [Service]
 Type=simple
-ExecStart=%h/.local/share/omarchy/bin/omarchy-system-sleep-monitor
+ExecStart=/usr/bin/omarchy-system-sleep-monitor
 Restart=always
 RestartSec=2