Enhance private NuGet source setup in build_windows and publish_release jobs to support fallback authentication using NUGET_USERNAME/NUGET_PASSWORD when CI_JOB_TOKEN is unavailable. Update log messages for clarity. Add diagnostic steps in build_windows to verify NuGet feed and package visibility using configured credentials. No changes to core build or publish logic.
Switched private NuGet source authentication in build_windows and publish_release jobs to use CI_JOB_TOKEN instead of NUGET_USERNAME/NUGET_PASSWORD. Updated related log messages and ensured PowerShell variable usage is correct for environment variables. This improves compatibility with GitLab CI best practices.
Renamed the private NuGet source from 'GitLab' to 'Nuget-GitLab-AIFotoONLUS' in CI scripts for clarity and consistency. Added a repository-level NuGet.Config with packageSourceMapping to ensure only specific private packages are restored from the GitLab feed, preventing 401 errors when restoring public packages from nuget.org.
- Add .gitlab-ci.yml for Windows CI/CD: build, publish, and GitLab Release with artifact upload
- Replace GitVersion.MsBuild with MinVer for versioning; update all versioning logic in .csproj
- Remove GitVersion CLI fallback for Visual Studio builds
- Update post-publish renaming to use MinVer's Version property
- Replace multiple thumbnail text checkboxes with a single ComboBox selector in MainWindow.xaml
- Change default UI startup: prefer WPF MainWindow, fallback to WinForms MainForm
