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/speedtest/main.tf

@@ -111,6 +111,10 @@ resource "kubernetes_deployment" "speedtest" {
             name  = "DB_PASSWORD"
             value = data.vault_kv_secret_v2.secrets.data["db_password"]
           }
+          env {
+            name  = "DB_PORT"
+            value = "3306"
+          }
           env {
             name  = "APP_TIMEZONE"
             value = "Europe/Sofia"