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/intel/fix-wifi7-eht.sh

@@ -0,0 +1,16 @@
+# Temporary fix for Dell XPS 14/16 on Panther Lake
+# Disable WiFi 7 (EHT/802.11be) on Intel BE200/BE211 cards
+# The iwlwifi driver has a broken EHT RX data path — APs drop to MCS 0 NSS 1
+# when EHT is negotiated, making WiFi unusable. Disabling EHT falls
+# back to WiFi 6 (HE/802.11ax) which works at full speed.
+# This should be removed when Intel fixes the firmware/driver.
+
+if lspci -nn | grep -qE '\[8086:(e440|272b)\]'; then
+  mkdir -p /etc/modprobe.d
+  cat > /etc/modprobe.d/iwlwifi-disable-eht.conf <<'EOF'
+# Temporary fix Dell XPS 14/16 on Panther lake
+# Disable WiFi 7 (EHT) on Intel BE200/BE211 — broken RX rate adaptation
+# Remove this file when fixes land in the iwlwifi EHT data path
+options iwlwifi disable_11be=Y
+EOF
+fi