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/fix-tuxedo-backlight.sh

@@ -0,0 +1,16 @@
+# Install Tuxedo drivers for keyboard backlighting on Tuxedo laptops and
+# compatible devices like the Slimbook Executive (Clevo/Tuxedo chassis).
+if cat /sys/class/dmi/id/sys_vendor 2>/dev/null | grep -qi "TUXEDO\|Slimbook"; then
+  omarchy-pkg-add linux-headers tuxedo-drivers-nocompatcheck-dkms
+
+  # Blacklist the legacy clevo_xsm_wmi module which conflicts with the tuxedo-drivers
+  # clevo_wmi module. When clevo_xsm_wmi loads first, it grabs the Clevo WMI GUIDs,
+  # preventing tuxedo-drivers from initializing the keyboard backlight properly.
+  mkdir -p /etc/modprobe.d
+  echo "blacklist clevo_xsm_wmi" > /etc/modprobe.d/blacklist-clevo-xsm-wmi.conf
+
+  # Remove any orphaned clevo_xsm_wmi module files not managed by a package
+  for f in /lib/modules/*/extra/clevo-xsm-wmi.ko; do
+    [ -f "$f" ] && rm "$f"
+  done
+fi