feat(events): migrate game-creation and bot flows to Redis Streams NCS-89 (#62)

Replace synchronous account→core game-creation HTTP call and plain
pub/sub bot game-start events with Redis Streams using consumer groups,
XACK, retry, and a Dead Letter Queue for at-least-once delivery and
observability.

- account: GameCreationStreamClient publishes game-creation requests and
  correlates responses via a per-instance consumer group (NCS-91)
- core: GameCreationStreamListener consumes requests, calls
  GameCreationService, publishes response events, retries, and routes
  exhausted/unparseable events to the DLQ (NCS-91, NCS-93, NCS-94)
- official-bots: bot game-start events migrated from pub/sub to Streams
  with consumer group, XACK, retry, and DLQ (NCS-92)
- account EventPublisher dual-writes to the stream and legacy pub/sub
  channel for backward compatibility
- all flows use the typed EventEnvelope (eventId/type/payload/timestamp/
  correlationId) with DLQ error context (eventType, error, attempt)
- register new DTOs and EventEnvelope/EventType for native reflection

Closes NCS-91, NCS-92, NCS-93, NCS-94

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

---------

Co-authored-by: Janis Eccarius <eccariusjanis@gmail.com>
Reviewed-on: #62

modules/core/build.gradle.kts

@@ -138,6 +138,8 @@ tasks.withType(org.gradle.api.tasks.scala.ScalaCompile::class).configureEach {
             exclude("**/resource/GameDtoMapper.scala")
             exclude("**/resource/GameResource.scala")
             exclude("**/redis/GameRedis*.scala")
+            exclude("**/redis/GameCreationStreamListener.scala")
+            exclude("**/service/GameCreationService.scala")
         }
     }
 }