[ci skip] Fix Alloy OOMKill and iDRAC priority class conflict

- Alloy: bump memory limits from 64Mi/128Mi to 256Mi/768Mi — pods were
  OOMKilled at 128Mi, steady-state usage is ~400-450Mi per node
- iDRAC Redfish Exporter: add explicit priority_class_name to resolve
  conflict between Kyverno priority injection and default priority: 0

modules/kubernetes/monitoring/alloy.yaml

@@ -100,10 +100,13 @@ alloy:
       }
 
   # Resource limits for DaemonSet pods
+  # Alloy tails logs from all containers on the node via K8s API and batches
+  # them to Loki. Memory scales with number of active log streams (~30-50 per node).
+  # 128Mi was OOMKilled; steady-state usage is ~400-450Mi per pod.
   resources:
     requests:
       cpu: 50m
-      memory: 64Mi
+      memory: 256Mi
     limits:
       cpu: 200m
-      memory: 128Mi
+      memory: 768Mi

modules/kubernetes/monitoring/idrac.tf

@@ -59,6 +59,7 @@ resource "kubernetes_deployment" "idrac-redfish" {
         }
       }
       spec {
+        priority_class_name = "tier-1-cluster"
         container {
           # https://github.com/mrlhansen/idrac_exporter?tab=readme-ov-file
           image = "ghcr.io/mrlhansen/idrac_exporter:latest"