Add a new GTK3-based Python application that displays an "About FWS" dialog with two tabs:
- "Le projet FWS" tab: shows project name, description, features, and home URL
- "Système" tab: displays system information including OS, kernel, desktop environment, hardware (CPU, memory, GPUs, disks)
The application detects system information from /proc, lsblk, lspci, and environment variables. It replaces the default Xfce About dialog with FWS branding.
