Refactored image creation APIs to use byte[] for logo data instead of System.Drawing.Image, enabling cross-platform support. Wrapped all GDI+/Windows-specific code in #if WINDOWS and updated project files to conditionally include Windows-only dependencies. Defaulted to ImageSharp on non-Windows, and updated UI and settings to reflect platform capabilities. Application now builds and runs on Linux/macOS with Avalonia and ImageSharp, while retaining full Windows functionality.
Introduce IImageCreator interface for image creation, and update ImageCreatorSharp to implement it. Add ImageCreatorAlternate (adapter) and ImageCreatorMapper (runtime selector) classes. Extend PicSettings with ImageCreatorProvider to control backend selection. Update DI registrations and refactor ImageCreationStuff to depend on IImageCreator, enabling backend switching via configuration.
