Implement Acer RGB control daemon and CLI

- Removed acer-rgb.cpp and replaced it with acer-rgb-cli.cpp for command-line interface functionality.
- Added acer-rgbd.cpp to implement a daemon that manages RGB settings for keyboard, lid, and button devices.
- Introduced a socket communication mechanism via acer-rgb.sh for sending commands to the daemon.
- Created service and socket files (acer-rgbd.service and acer-rgbd.socket) for systemd integration, allowing the daemon to run as a service.
- Implemented state persistence for RGB settings in /var/lib/acer-rgbd/state.txt, enabling restoration on boot.

acer-rgb.sh

@@ -0,0 +1,18 @@
+#!/usr/bin/env bash
+set -euo pipefail
+
+SOCK="/run/acer-rgbd.sock"
+
+if [[ $# -lt 1 ]]; then
+  echo "Usage:"
+  echo "  acer-rgb GET"
+  echo "  acer-rgb SET hidraw=/dev/hidraw2 dev=keyboard effect=static bright=80 r=255 g=0 b=0 zone=all"
+  exit 2
+fi
+
+cmd="$*"
+if command -v socat >/dev/null 2>&1; then
+  printf "%s\n" "$cmd" | socat - UNIX-CONNECT:"$SOCK"
+else
+  printf "%s\n" "$cmd" | nc -U "$SOCK"
+fi