feat: implement periodic scaling checks and enhance instance management in AutoScaler

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

@@ -60,8 +60,8 @@ class GameEngine(
   @SuppressWarnings(Array("DisableSyntax.var"))
   private var pendingTakebackRequest: Option[Color] = initialTakebackRequest
 
+  GameEngine.activeGamesCount.incrementAndGet()
   meterRegistry.foreach { reg =>
-    GameEngine.activeGamesCount.incrementAndGet()
     reg.counter("nowchess.games.started").increment()
   }
   private def gamesCompletedCounter(result: String): Counter =

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

@@ -199,7 +199,7 @@ class InstanceHeartbeatService:
         val json = mapper.writeValueAsString(metadata)
         reactiveRedis
           .value(classOf[String])
-          .setex(key, 5L, json)
+          .setex(key, 15L, json)
           .subscribe()
           .`with`(
             _ => redisHeartbeatPending.set(false),