Prusa ships no Linux binary as of 3.0 — the GitHub release has only .dmg and .zip, and Flathub is now the sole Linux channel, with alphas in flathub-beta. nixpkgs' services.flatpak only exposes `enable`, so this pulls in nix-flatpak for declarative remotes and packages. Co-Authored-By: Claude <noreply@anthropic.com>