Adds a 'netbird' keyword to the existing extras prompt, dispatching
services/base.sh's _base_setup_netbird helper — a plain function like
any other once setup.sh sources every services/*.sh file, despite its
underscore-prefixed, not-independently-registered naming. Its own
prompt already defaults to enabling NetBird's built-in SSH server
(--allow-server-ssh), which is what makes the 'backup' extra usable
against a home machine without port-forwarding a router: install
NetBird here and on that machine, join both to the same network, and
Borg's SSH remote target becomes the home machine's mesh IP instead of
a public address. Skips cleanly if NetBird's already installed.
README's Optional extras section documents the pairing.
Claude
36e56c343b