The API already returned Gitea's updated_at for every repo but the page
never displayed it. The Gitea table now has a sortable "Last updated"
column with a relative age ("3 d ago") over the exact date/time (in the
app's configured date format), and the CSV export includes it.
Gitea only exposes a single updated_at per repository (there is no
separate last-push time), so this is Gitea's own notion of "updated".
Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>