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/calibre/main.tf

@@ -215,6 +215,7 @@ resource "kubernetes_deployment" "calibre-web-automated" {
               path = "/"
               port = 8083
             }
+            timeout_seconds   = 5
             period_seconds    = 30
             failure_threshold = 3
           }