v0.4.9 — info offers to install nmap for the network scanner

info offers to install nmap for the network scanner

Recommends: weak dependencies (like nmap for the network scanner) only
auto-install on a fresh dnf install — an upgrade of an already-installed
vulnscan-ai does not retroactively pull in a newly added weak dependency.

vulnscan-ai info now explains exactly why the network scanner is
unavailable (missing network_targets config, missing nmap, or both)
instead of just printing "unavailable", and when nmap is the only thing
missing it offers to install it right there via dnf install -y nmap
(interactively, TTY only) or prints the command to run yourself otherwise.

328 tests, bandit clean.