Packaging: Flatpak, .deb, .rpm, Windows MSI, macOS .app

[PyXiion]

Origin of idea

Only packaging format is a Nuitka standalone binary (+ AppImage on Linux). No distribution-native formats.

Suggestion / proposed solution

Priority order:

1. Windows MSI/NSIS installer — start menu shortcut, uninstaller, file associations
2. Flatpak — com.github.PyXiion.PxModRim manifest, sandbox permissions for ~/.steam and RimWorld dirs
3. .deb / .rpm — lower priority, AppImage covers most Linux use cases
4. macOS .app bundle — create proper Info.plist, bundle structure, code-sign
   CI should build these on tag pushes alongside existing Nuitka builds.

Alternatives considered

No response

Additional context

No response