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/fred.sh

@@ -0,0 +1,13 @@
+# Enable Flexible Return and Event Delivery on Intel Panther Lake.
+
+DROP_IN="/etc/limine-entry-tool.d/intel-panther-lake-fred.conf"
+
+if omarchy-hw-intel-ptl; then
+  if [[ ! -f $DROP_IN ]] || ! grep -q 'fred=on' "$DROP_IN"; then
+    sudo mkdir -p /etc/limine-entry-tool.d
+    cat <<EOF | sudo tee "$DROP_IN" >/dev/null
+# Intel Panther Lake FRED support
+KERNEL_CMDLINE[default]+=" fred=on"
+EOF
+  fi
+fi