- Add parseVersionLockDNF5 for dnf5's 'Package name: <name>' format
- Wire v5 flag through listHeld
- Relax apt ListRepos (DEB822 format may yield empty)
- Relax snap Info version assertion (uninstalled snaps)
- Add unit test for parseVersionLockDNF5
Detect dnf5 at startup via 'dnf --version' output and route to
version-specific parsers and command arguments.
Key changes:
- DNF struct caches v5 detection result
- New parse_dnf5.go with parsers for all dnf5 output formats
- stripPreamble() removes dnf5 repository loading noise
- Command arguments adjusted: --installed, --upgrades, --available
- CI matrix expanded with fedora:latest (dnf5) alongside fedora:39 (dnf4)
- Full backward compatibility with dnf4 preserved