Split user defaults into skel seed, finalize, and resync

Reorganizes Omarchy 4 around three layers for populating $HOME:

  Seed:     omarchy-settings ships defaults to /etc/skel; useradd -m
            copies them on user creation
  Finalize: omarchy-finalize-user (renamed from omarchy-setup-user)
            handles only the runtime tweaks /etc/skel can't do — skill
            symlinks, xdg-user-dirs, default browser/mailto, vconsole→hypr
            keyboard sync, and install/user/all.sh
  Resync:   omarchy-reinstall-configs is the explicit, destructive
            resync of /etc/skel into an existing user's $HOME

Package-owned files move out of config/ into default/, where the
omarchy-settings PKGBUILD installs them to real system paths:

  config/environment.d/fcitx.conf            -> /usr/lib/environment.d/
  config/fontconfig/fonts.conf               -> /usr/share/fontconfig/conf.avail/
  config/mimeapps.list                       -> /usr/share/applications/
  config/omarchy.ttf                         -> /usr/share/fonts/omarchy/
  config/systemd/user/*.service              -> /usr/lib/systemd/user/
  config/uwsm/default                        -> /usr/share/omarchy/default/uwsm/
  config/uwsm/env                            -> /usr/share/uwsm/env.d/10-omarchy
  config/xdg-terminals.list                  -> /usr/share/xdg-terminal-exec/

omarchy-upgrade-to-4 grows a 'retire' action (renamed from 'move' to
clarify nothing is copied — the system path is owned by the new package
once the user's hash-matched ~/.config copy is removed). Mismatched
copies are kept as backups so user overrides survive the upgrade.

Other simplifications:

  - Single env bootstrap at default/bash/env-bootstrap sourced by
    /etc/profile.d/omarchy.sh, /etc/skel/.bashrc,
    /usr/share/uwsm/env.d/10-omarchy, and default/bash/envs. PATH
    prepend only in dev-link mode (production uses /usr/bin/omarchy-*).
  - omarchy-refresh-config reads from /etc/skel/.config so refresh
    means 'snap to skel'.
  - omarchy-reinstall-configs collapses to 'cp -af /etc/skel/. ~/'
    plus limine/plymouth/nvim refresh.
  - omarchy-font-set uses awk against our own 30-omarchy.conf instead
    of xmlstarlet; xmlstarlet dropped from omarchy-base.packages.
  - Defer user systemd enables (bt-agent, sleep-lock,
    recover-internal-monitor) to first-run via
    install/user/first-run/enable-user-units.sh; delete
    omarchy-user-systemctl-enable and the per-hardware install
    scripts that called it.
  - Wireplumber bluetooth-a2dp-autoconnect.conf moves to config/ so
    /etc/skel ships it; install/user/hardware/bluetooth.sh deleted.
  - Default terminal switched to foot.desktop.
  - docs/file-layout.md documents the three-layer model and the
    build-time repo→path map.

bin/omarchy-first-run

@@ -15,12 +15,12 @@ USAGE
 }
 
 force=0
-setup_user_args=()
+finalize_user_args=()
 while (($#)); do
   case "$1" in
     --force)
       force=1
-      setup_user_args+=(--force)
+      finalize_user_args+=(--force)
       shift
       ;;
     -h|--help)
@@ -35,7 +35,7 @@ while (($#)); do
   esac
 done
 
-omarchy-setup-user "${setup_user_args[@]}" || true
+omarchy-finalize-user "${finalize_user_args[@]}" || true
 
 state_dir=~/.local/state/omarchy
 mkdir -p "$state_dir"
@@ -97,8 +97,8 @@ if [[ ! -f $USER_MARKER || $force -eq 1 ]]; then
   run_first_run_step "install Voxtype post-update hook" \
     omarchy-hook-install post-update "$OMARCHY_PATH/install/user/first-run/install-voxtype.hook"
 
-  run_first_run_step "recover internal monitor" \
-    bash "$OMARCHY_PATH/install/user/hardware/recover-internal-monitor.sh"
+  run_first_run_step "enable user systemd units" \
+    bash "$OMARCHY_PATH/install/user/first-run/enable-user-units.sh"
   run_first_run_step "set GNOME theme" \
     bash "$OMARCHY_PATH/install/user/first-run/gnome-theme.sh"
   run_first_run_step "set GTK primary paste" \