Stone.js API
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    realtimeBlueprint: RealtimeBlueprint = ...

    Opt-in blueprint: import and register it to enable realtime.

    It contributes the RealtimeServiceProvider, which binds realtimeManager and the default connection as realtime. Configure connections under stone.realtime (or use @Realtime()). The listener side is the light key-router (@RealtimeGateway). stone.providers is an array, so this merges.