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.

install/hardware/set-wireless-regdom.sh

@@ -0,0 +1,24 @@
+# Persist wireless regulatory domain based on the target timezone. Install is
+# followed by reboot, so don't mutate live Wi-Fi state with `iw reg set`.
+regdom_file=/etc/conf.d/wireless-regdom
+[[ -f $regdom_file ]] || exit 0
+
+if grep -q '^WIRELESS_REGDOM=' "$regdom_file"; then
+  exit 0
+fi
+
+timezone=""
+if [[ -e /etc/localtime ]]; then
+  timezone=$(readlink -f /etc/localtime || true)
+  timezone=${timezone#/usr/share/zoneinfo/}
+fi
+
+country="${timezone%%/*}"
+zone_tab=/usr/share/zoneinfo/zone.tab
+if [[ ! $country =~ ^[A-Z]{2}$ && -n $timezone && -f $zone_tab ]]; then
+  country=$(awk -v tz="$timezone" '$3 == tz {print $1; exit}' "$zone_tab")
+fi
+
+if [[ $country =~ ^[A-Z]{2}$ ]]; then
+  echo "WIRELESS_REGDOM=\"$country\"" | sudo tee -a "$regdom_file" >/dev/null
+fi