Initial commit: unified nvchecker config and nvtable

Merge a personal nvchecker config with the .extras/nvchecker.toml of three
SlackBuild repositories into a single deduplicated config, and add nvtable,
which joins nvchecker's upstream results against the version installed on
this host and the version shipped by the packaging repo.

The stanza name is the Slackware package name wherever a package exists, so
results join directly against /var/log/packages and <pkg>/<pkg>.info; nvtable
carries a small alias map for the cases that genuinely differ.

Installed versions are resolved from /var/log/packages, the appimage-updater
state file, and flatpak. Caught-up packages are recorded with nvtake under an
flock, so old_ver tracks this system rather than only upstream history.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>

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