feat(11-03): add the lighthouse realtime package and its Centrifugo driver

- lighthouse: Service/From with realtime.driver selection, RegisterDriver
  registry, null/log/memory drivers, Route/Surface/Mount, users and actors
- centrifugo: HTTP API client (apikey header, 2xx success, no request
  without a key), five-generator HS256 TokenIssuer, TokenHandler with the
  WinterCMS 401/503 bodies
- module README and root modules table row

README.md

@@ -92,6 +92,7 @@ The `migrate`, `migrate:status`, `migrate:rollback`, `serve` and admin commands
 | [festival](modules/festival/README.md) | Typed, synchronous event bus with listener priorities, payload collection and stop-when-handled dispatch. |
 | [fetchguard](modules/fetchguard/README.md) | Guarded outbound HTTPS fetcher that blocks private and reserved addresses and enforces host, size and timeout limits. |
 | [lagoon](modules/lagoon/README.md) | Postgres data layer: the shared GORM connection, per-plugin migrations, model helpers and file attachments. |
+| [lighthouse](modules/lighthouse/README.md) | Transport-neutral realtime: a publisher interface with pluggable drivers, subscribe-time channel authorization, and model broadcasts enqueued in the write transaction. |
 | [pact](modules/pact/README.md) | Capability interfaces that compiled plugins implement to contribute routes, config, migrations, middleware, commands, admin screens, translations, mail templates and jobs. |
 | [party](modules/party/README.md) | Compiled plugin registry that orders plugins by their dependencies and runs their Register and Boot lifecycle. |
 | [phrasebook](modules/phrasebook/README.md) | Namespaced translation catalogs loaded from plugin YAML, with locale fallback, placeholder interpolation and CLDR pluralization. |