v0.1.25.10 custom Micrometer counters + Redis-disconnect test

What's Changed

• feat(metrics): v0.1.25.10 — custom Micrometer counters + Redis-disconnect test by @amavashev in #97

Adds seven domain-level counters under the cycles_* namespace (reserve, commit, release, extend, expired, events, overdraft.incurred) so operators can answer "how many denials in the last 5 minutes by reason and tenant" without reverse-engineering it from HTTP status codes. New RedisDisconnectResilienceIntegrationTest pauses its Testcontainers Redis mid-request to prove the service fails cleanly and recovers.

Dormant bug fixed: ReservationExpiryService.emitExpiredEvent used the wrong Redis key prefix, silently no-op'ing on every expiry since v0.1.25.3. Surfaced immediately by the new cycles.reservations.expired counter test.

Wire format unchanged vs v0.1.25.9 — no request/response body changes.

Full Changelog: v0.1.25.9...v0.1.25.10