feat(coordinator): enhance instance management with game migration count and configurable ports

modules/core/src/main/scala/de/nowchess/chess/engine/GameEngine.scala

@@ -426,7 +426,7 @@ class GameEngine(
 
     if currentContext.halfMoveClock >= 100 then notifyObservers(FiftyMoveRuleAvailableEvent(currentContext))
     if status.isThreefoldRepetition then notifyObservers(ThreefoldRepetitionAvailableEvent(currentContext))
-    else requestBotMoveIfNeeded()
+    requestBotMoveIfNeeded()
 
   private def translateMoveToNotation(move: Move, boardBefore: Board): String =
     move.moveType match

modules/core/src/main/scala/de/nowchess/chess/grpc/CoordinatorServiceHandler.scala

@@ -55,10 +55,10 @@ class CoordinatorServiceHandler extends CoordinatorServiceGrpc.CoordinatorServic
       request: DrainInstanceRequest,
       responseObserver: StreamObserver[DrainInstanceResponse],
   ): Unit =
-    gameSubscriberManager.drainInstance()
+    val migrated = gameSubscriberManager.drainInstance()
     val response = DrainInstanceResponse
       .newBuilder()
-      .setGamesMigrated(0)
+      .setGamesMigrated(migrated)
       .build()
     responseObserver.onNext(response)
     responseObserver.onCompleted()

modules/core/src/main/scala/de/nowchess/chess/redis/GameRedisSubscriberManager.scala

@@ -133,9 +133,11 @@ class GameRedisSubscriberManager:
     }
     count
 
-  def drainInstance(): Unit =
+  def drainInstance(): Int =
     val gameIds = new java.util.ArrayList(c2sListeners.keySet())
+    val count   = gameIds.size()
     gameIds.forEach(unsubscribeGame)
+    count
 
   @PreDestroy
   def cleanup(): Unit =

modules/core/src/main/scala/de/nowchess/chess/service/InstanceHeartbeatService.scala

@@ -6,9 +6,9 @@ import jakarta.inject.Inject
 import io.quarkus.runtime.StartupEvent
 import io.quarkus.runtime.ShutdownEvent
 import io.quarkus.grpc.GrpcClient
+import org.eclipse.microprofile.config.inject.ConfigProperty
 import org.redisson.api.RedissonClient
 import scala.annotation.nowarn
-import scala.concurrent.duration.*
 import scala.compiletime.uninitialized
 import java.util.concurrent.{Executors, TimeUnit}
 import java.net.InetAddress
@@ -18,7 +18,6 @@ import de.nowchess.coordinator.proto.{CoordinatorServiceGrpc, *}
 import de.nowchess.coordinator.proto.CoordinatorServiceGrpc.CoordinatorServiceStub
 import io.grpc.stub.StreamObserver
 import io.grpc.Channel
-import scala.jdk.FutureConverters.*
 
 @ApplicationScoped
 class InstanceHeartbeatService:
@@ -28,6 +27,12 @@ class InstanceHeartbeatService:
   @GrpcClient("coordinator-grpc")
   private var channel: Channel = uninitialized
 
+  @ConfigProperty(name = "quarkus.http.port", defaultValue = "8080")
+  private var httpPort: Int = 0
+
+  @ConfigProperty(name = "quarkus.grpc.server.port", defaultValue = "9000")
+  private var grpcPort: Int = 0
+
   private var coordinatorStub: CoordinatorServiceStub = uninitialized
 
   private val log    = Logger.getLogger(classOf[InstanceHeartbeatService])
@@ -97,7 +102,8 @@ class InstanceHeartbeatService:
 
         override def onError(t: Throwable): Unit =
           log.warnf(t, "Heartbeat stream error")
-          () // Placeholder for reconnect logic
+          streamObserver = None
+          heartbeatExecutor.schedule((() => initializeHeartbeatStream()): Runnable, 5, TimeUnit.SECONDS)
 
         override def onCompleted: Unit =
           log.info("Heartbeat stream completed")
@@ -133,8 +139,8 @@ class InstanceHeartbeatService:
           .newBuilder()
           .setInstanceId(instanceId)
           .setHostname(getHostname)
-          .setHttpPort(8080) // Placeholder, should be configurable
-          .setGrpcPort(9080) // Placeholder
+          .setHttpPort(httpPort)
+          .setGrpcPort(grpcPort)
           .setSubscriptionCount(subscriptionCount)
           .setLocalCacheSize(localCacheSize)
           .setTimestampMillis(System.currentTimeMillis())
@@ -153,8 +159,8 @@ class InstanceHeartbeatService:
       val metadata = Map(
         "instanceId"        -> instanceId,
         "hostname"          -> getHostname,
-        "httpPort"          -> 8080,
-        "grpcPort"          -> 9080,
+        "httpPort"          -> httpPort,
+        "grpcPort"          -> grpcPort,
         "subscriptionCount" -> subscriptionCount,
         "localCacheSize"    -> localCacheSize,
         "lastHeartbeat"     -> java.time.Instant.now().toString,