feat(audit): address batch 1 of missing scripts and enable fwupd

- Move 18 Hyprland/desktop scripts from features/desktop/scripts/ to packaged directories
- Add nomarchy.hardware.fwupd option (default false) and enable service
- Implement nomarchy-update-firmware wrapper for fwupdmgr
- Add hyprland, swayosd, and fwupd to nomarchy-system-scripts dependencies
- Update docs/SCRIPTS.md with 'kept' status for ported scripts

core/system/scripts/nomarchy-swayosd-kbd-brightness

@@ -0,0 +1,15 @@
+#!/bin/bash
+
+# Display keyboard brightness level using SwayOSD on the current monitor.
+# Usage: nomarchy-swayosd-kbd-brightness <percent>
+
+percent="$1"
+
+progress="$(awk -v p="$percent" 'BEGIN{printf "%.2f", p/100}')"
+[[ $progress == "0.00" ]] && progress="0.01"
+
+swayosd-client \
+  --monitor "$(hyprctl monitors -j | jq -r '.[]|select(.focused==true).name')" \
+  --custom-icon keyboard-brightness \
+  --custom-progress "$progress" \
+  --custom-progress-text "${percent}%"