- Add new system.rs module for system monitoring via D-Bus:
- Battery status (UPower)
- Media player controls and metadata (MPRIS)
- WiFi/Bluetooth status (NetworkManager)
- Keyboard layout tracking
- Add media key support (XF86 Play/Pause/Next/Prev)
- Add function keys F1-F3 for Suspend/Reboot/PowerOff
- Replace deprecated timer.rs with async system management
- Add GitHub Actions CI/CD workflows (CI + Release)
- Update dependencies and add optional networking feature