fix(coordinator): use genericKubernetesResources API for Argo Rollout scaling (#43)

fabric8 disallows client.resources(classOf[GenericKubernetesResource]) — throws
KubernetesClientException at runtime. Switch to genericKubernetesResources(apiVersion, kind)
which is the correct API for CRDs.

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

Reviewed-on: #43
Co-authored-by: Janis <janis.e.20@gmx.de>
Co-committed-by: Janis <janis.e.20@gmx.de>

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

@@ -30,6 +30,9 @@ class AutoScaler:
     if kubeClientInstance.isUnsatisfied then None
     else Some(kubeClientInstance.get())
 
+  private val argoApiVersion = "argoproj.io/v1alpha1"
+  private val argoKind       = "Rollout"
+
   // scalafix:off DisableSyntax.asInstanceOf
   // scalafix:off DisableSyntax.isInstanceOf
   private def rolloutSpec(rollout: GenericKubernetesResource): Option[java.util.Map[String, AnyRef]] =
@@ -61,7 +64,7 @@ class AutoScaler:
         try
           Option(
             kube
-              .resources(classOf[GenericKubernetesResource])
+              .genericKubernetesResources(argoApiVersion, argoKind)
               .inNamespace(config.k8sNamespace)
               .withName(config.k8sRolloutName)
               .get(),
@@ -102,7 +105,7 @@ class AutoScaler:
         try
           Option(
             kube
-              .resources(classOf[GenericKubernetesResource])
+              .genericKubernetesResources(argoApiVersion, argoKind)
               .inNamespace(config.k8sNamespace)
               .withName(config.k8sRolloutName)
               .get(),