Refuse omarchy-dev-{link,unlink} when invoked under sudo

When the script is run under outer sudo, the environment loses
HYPRLAND_INSTANCE_SIGNATURE, XDG_RUNTIME_DIR, and DBUS_SESSION_BUS_ADDRESS,
so the 'hyprctl version' check silently fails and the live-session
refresh (setenv / import-environment / restart shell / hyprctl reload)
gets skipped. The user is left with /etc/omarchy.conf written but no
session updates — confusing because the env in the current shell still
shows the old value.

Reject EUID=0 invocations with a clear message pointing at the right
pattern: invoke as your user, the script prompts for sudo only when it
needs to write /etc/omarchy.conf.

bin/omarchy-dev-unlink

@@ -5,6 +5,12 @@
 
 set -euo pipefail
 
+if [[ $EUID -eq 0 ]]; then
+  echo "Error: run omarchy-dev-unlink as your user, not under sudo. The script" >&2
+  echo "       will prompt for sudo when it needs to remove /etc/omarchy.conf." >&2
+  exit 1
+fi
+
 if [[ ${1:-} == "-h" || ${1:-} == "--help" ]]; then
   cat <<USAGE
 Usage: omarchy dev unlink