fix cluster health: resolve 21/23 failures from healthcheck

- nvidia: change GPU taint NoSchedule -> PreferNoSchedule to allow
  overflow scheduling on k8s-node1 (frees ~7Gi capacity)
- kyverno: increase reports-controller memory 256Mi -> 512Mi (OOMKilled)
- speedtest: add missing DB_PORT=3306 env var (nc: service "" unknown)
- realestate-crawler: increase API memory 64Mi -> 256Mi (OOMKilled)
- calibre: increase liveness probe timeout 1s -> 5s (false restarts)

stacks/platform/modules/kyverno/main.tf

@@ -30,11 +30,11 @@ resource "helm_release" "kyverno" {
     reportsController = {
       resources = {
         limits = {
-          memory = "256Mi"
+          memory = "512Mi"
         }
         requests = {
           cpu    = "100m"
-          memory = "128Mi"
+          memory = "384Mi"
         }
       }
     }

stacks/platform/modules/nvidia/main.tf

@@ -37,7 +37,7 @@ resource "kubernetes_resource_quota" "nvidia_quota" {
 resource "null_resource" "gpu_node_config" {
   provisioner "local-exec" {
     command = <<-EOT
-      kubectl taint nodes k8s-node1 nvidia.com/gpu=true:NoSchedule --overwrite
+      kubectl taint nodes k8s-node1 nvidia.com/gpu=true:PreferNoSchedule --overwrite
       kubectl label nodes k8s-node1 gpu=true --overwrite
     EOT
   }