fix(test): mock IoGrpcClientWrapper in GameCreationServiceTest, disable stream listener in core tests

GameCreationServiceTest called createGame which routes through
RedisGameRegistry.store → IoGrpcClientWrapper.exportCombined, hitting a
real gRPC stub that fails with UNIMPLEMENTED in tests.

MockRedisDataSourceProducer's RETURNS_DEEP_STUBS mock caused a classloader
mismatch when GameCreationStreamListener called .stream() on it
(PubSubCommands mock returned instead of StreamCommands).

- Add @InjectMock IoGrpcClientWrapper + @BeforeEach stub in GameCreationServiceTest
- Add nowchess.game-creation-stream.enabled: false to core test application.yml

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

modules/core/src/test/resources/application.yml

@@ -18,6 +18,8 @@ nowchess:
       enabled: false
   coordinator:
     enabled: false
+  game-creation-stream:
+    enabled: false
   redis:
     host: localhost
     port: 6379

modules/core/src/test/scala/de/nowchess/chess/service/GameCreationServiceTest.scala

@@ -3,13 +3,16 @@ package de.nowchess.chess.service
 import de.nowchess.api.dto.{GameCreationRequestDto, PlayerInfoDto, TimeControlDto}
 import de.nowchess.api.game.{GameMode, TimeControl}
 import de.nowchess.api.player.PlayerType
+import de.nowchess.chess.client.CombinedExportResponse
+import de.nowchess.chess.grpc.IoGrpcClientWrapper
 import de.nowchess.chess.redis.GameRedisSubscriberManager
 import io.quarkus.test.InjectMock
 import io.quarkus.test.junit.QuarkusTest
 import jakarta.inject.Inject
 import org.junit.jupiter.api.Assertions.*
-import org.junit.jupiter.api.{DisplayName, Test}
-import org.mockito.Mockito.verify
+import org.junit.jupiter.api.{BeforeEach, DisplayName, Test}
+import org.mockito.ArgumentMatchers.any
+import org.mockito.Mockito.{verify, when}
 import scala.compiletime.uninitialized
 
 // scalafix:off
@@ -23,6 +26,14 @@ class GameCreationServiceTest:
   @InjectMock
   var subscriberManager: GameRedisSubscriberManager = uninitialized
 
+  @InjectMock
+  var ioWrapper: IoGrpcClientWrapper = uninitialized
+
+  @BeforeEach
+  def setup(): Unit =
+    when(ioWrapper.exportCombined(any()))
+      .thenReturn(CombinedExportResponse("rnbqkbnr/pppppppp/8/8/8/8/PPPPPPPP/RNBQKBNR w KQkq - 0 1", ""))
+
   private def player(id: String, name: String): PlayerInfoDto =
     PlayerInfoDto(id, name, PlayerType.Human)