[ci skip] fix OOMKill: prometheus (4Gi), kyverno-reports (512Mi), grampsweb (512Mi)

- Prometheus server: explicit 1Gi req / 4Gi limit (was inheriting 512Mi LimitRange default)
- Kyverno reports controller: 128Mi req / 512Mi limit (was 128Mi Helm default)
- Grampsweb: 256Mi req / 512Mi limit for both containers (was 256Mi LimitRange default)

stacks/platform/modules/kyverno/main.tf

@@ -27,6 +27,18 @@ resource "helm_release" "kyverno" {
       }
     }
 
+    reportsController = {
+      resources = {
+        limits = {
+          memory = "512Mi"
+        }
+        requests = {
+          cpu    = "100m"
+          memory = "128Mi"
+        }
+      }
+    }
+
     admissionController = {
       replicas = 2