fix: revert pod matching to original logic instanceId.contains(podName)

Accidentally flipped pod matching direction in previous commits. Changed from correct instanceId.contains(podName) to incorrect podName.contains(instanceId), causing all health checks to fail.

Reverted all 3 locations to original working logic.

Co-Authored-By: Claude Haiku 4.5 <noreply@anthropic.com>

modules/coordinator/src/main/scala/de/nowchess/coordinator/service/HealthMonitor.scala

@@ -131,7 +131,7 @@ class HealthMonitor:
 
         pods.exists { pod =>
           val podName = pod.getMetadata.getName
-          podName.contains(instanceId) && isPodReady(pod)
+          instanceId.contains(podName) && isPodReady(pod)
         }
       catch
         case ex: Exception =>
@@ -185,7 +185,7 @@ class HealthMonitor:
             .getItems
             .asScala
 
-          pods.find(pod => pod.getMetadata.getName.contains(instanceId)) match
+          pods.find(pod => instanceId.contains(pod.getMetadata.getName)) match
             case Some(pod) =>
               val podName = pod.getMetadata.getName
               kube.pods().inNamespace(config.k8sNamespace).withName(podName).withGracePeriod(0L).delete()
@@ -244,4 +244,4 @@ class HealthMonitor:
 
   private def findRegisteredInstance(pod: Pod): Option[InstanceMetadata] =
     val podName = pod.getMetadata.getName
-    instanceRegistry.getAllInstances.find(inst => podName.contains(inst.instanceId))
+    instanceRegistry.getAllInstances.find(inst => inst.instanceId.contains(podName))