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We are introducing a companion service to the relay that needs pubkey event mentions for pubkeys it manages. This PR introduces an outbox for pubkey mentions that will be sent to these "operator listener" services. ## Summary Deliver mentions of registered pubkeys to deployment-global operator listeners. - Configure listeners with `BUZZ_OPERATOR_LISTENERS`; listeners manage target pubkeys through NIP-98-authenticated `POST`/`DELETE /operator/listener/pubkeys` requests. - During supported event ingestion, match `p` tags to registrations and insert one outbox row per listener in the event transaction. - A background worker claims up to 10 rows, sends NIP-98-signed notifications, and retries transient failures with exponential backoff for up to 9 attempts (idle polling backs off from 250 ms to 2 s). - Outbox rows are ineligible for delivery after 15 minutes and are reaped every 5 minutes. Registered pubkeys live for 30 days; re-registering renews them, and a daily reaper removes expired registrations. - Keep persistence app-managed: no database triggers, functions, foreign keys, or separate match queue. ## Changed behavior Listener outbox rows are enqueued inside the shared event-insert and thread-metadata transactions; enqueue failure rolls back the event. `event_mentions` behavior is unchanged: ordinary event/reaction mention indexing remains post-commit best effort with warning-only failures. ## Testing - `cargo fmt --all` - `cargo test -p buzz-db --lib` - `cargo test -p buzz-relay --lib config::tests::operator_listener_routes` - `cargo check -p buzz-db -p buzz-relay`