prisma-risk / tsoracle / 26415728628

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perf(server): add non-cloning is_serving() for the hot-path gate (#436)

The fast NOT_LEADER gate in get_ts called ServingCore::serving_state(),
which clones a whole ServingState out of the watch channel only to match
on it and discard it. Add a borrow-and-match is_serving() and use it for
the gate so the serving path no longer materializes a value it throws away.

The rejected path keeps cloning through serving_state() (via the existing
leader_hint_from helper): LeaderHint needs an owned leader-endpoint String
for the response, so that clone is unavoidable there. The two reads on the
rejection path are not atomic, but the redirect hint is best-effort either
way and this matches the NotLeader arm that already re-reads after try_grant.

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