Get Unread Counts

Unreplied-hot-lead counts for the sidebar badges, split out of /user.

The unreplied_hot CTE is the heaviest part of the old app-shell query; serving it here lets the sidebar render instantly and hydrate the badges from a separate, non-blocking poll. Redis-cached per org (short TTL) so the poll — and concurrent org members / tabs — stay cheap.

Org-scoped by the org's segment ids and deliberately NOT filtered by the viewer's user_email, so every member sees the org's real hot-lead counts (matches the old /user behaviour and the dashboard CTA).