Re-enabling vhost (via `proxy:enable`, `domains:enable`, or `domains:add` with no global VHOST) was leaving the app pinned to the random high port and the empty VHOST file from the previous disabled state, so the new catch-all vhost intercepted requests for the app's domain. The `domains-enable` trigger now restores default vhosts via `domains_enable`, and `pre-enable-vhost` clears any stored proxy ports so they can be recomputed to 80/443. Also fixes the netrc lookup in the `git:auth` test to read dokku's netrc file directly.
