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/asus/fix-asus-ptl-b9406-display.sh

@@ -0,0 +1,15 @@
+# Display fix for ASUS ExpertBook B9406 (Panther Lake / Xe3 iGPU).
+#
+# Panel Replay is Xe3-new, default-on in the xe driver, and has a broken
+# exit/wake path on this eDP panel: the panel latches the last-presented
+# frame in self-refresh and never wakes for subsequent atomic commits, so
+# the screen only updates on a full modeset (e.g. a VT switch). The older
+# xe.enable_psr=0 knob does not cover Panel Replay.
+
+if omarchy-hw-asus-expertbook-b9406; then
+  mkdir -p /etc/limine-entry-tool.d
+  cat > /etc/limine-entry-tool.d/asus-expertbook-b9406-display.conf <<'EOF'
+# ASUS ExpertBook B9406 (Panther Lake / Xe3) display workaround
+KERNEL_CMDLINE[default]+=" xe.enable_panel_replay=0"
+EOF
+fi