- Created autoinstaller_gui/ directory as requested
- Implemented autoinstallergui.py: Fullscreen PyQt6 GUI that reproduces auto-installer.sh functionality
  - Graphical timezone selection dialog (continent → city list, no numbers)
  - Optional network configuration (checkbox + dropdowns)
  - Real-time progress bar (0-100%)
  - Read-only text window for command output/logs
  - Background threading for non-blocking installation
  - Error handling with QMessageBox alerts
  - Auto-reboot after successful installation
- Added build_autoinstaller_gui.py: PyInstaller script for single Linux binary
- Created README.md in autoinstaller_gui/ with complete instructions for usage and building standalone binary

The GUI provides a complete graphical interface for the automated installer
with all interactive parts handled visually. The build script creates a single
executable binary for Linux deployment.

This completes the AutoInstaller GUI implementation as requested.