Introduce Avalonia as a new cross-platform UI option, including new XAML and code-behind files for the application and main window. Update Program.cs to support a --avalonia launch argument and add corresponding launch profile. Integrate Avalonia NuGet packages and ensure DataModel supports UI-thread invocation for all frontends. All business logic and state are shared via DI, enabling consistent behavior across WinForms, WPF, and Avalonia.
Refactored Program.cs to accept command-line arguments and select between WinForms (default) and WPF UI based on the presence of --wpf. Removed old commented-out UI selection code. Updated launchSettings.json to provide separate profiles for WinForms and WPF launches. If WPF is requested but unavailable, the app falls back to WinForms.
Integrates optional AI/OCR (AIFotoONLUS.Core) support to extract numbers from images after processing. Adds new "AI" tab in the UI for enabling extraction, selecting models folder, specifying CSV output, and previewing results. Results can be exported to CSV. Uses reflection for AI library invocation, with fallback simulation if unavailable. Persists new AI settings. Updates related NuGet packages and adds theme resources.
