feat(consul): deploy HashiCorp Consul 1.22.7 via Helm chart 1.9.7

5-replica server cluster (bootstrapExpect=5) with datacenter=au-syd1,
connect enabled, raft_multiplier=10, http=8500, grpc=8502, https=-1.
10Gi cephrbd-fast-delete PVC. Gateway API HTTPRoute on 443→consul-consul-ui:80→8500.
PDB patched from policy/v1beta1 to policy/v1 for k8s 1.25+.
ArgoCD platform ApplicationSet updated to include consul overlay path.

apps/base/consul/httproute.yaml

@@ -0,0 +1,23 @@
+---
+apiVersion: gateway.networking.k8s.io/v1
+kind: HTTPRoute
+metadata:
+  name: consul
+  namespace: consul
+  labels:
+    app.kubernetes.io/name: consul
+    app.kubernetes.io/instance: consul
+spec:
+  hostnames:
+    - consul.k8s.syd1.au.unkin.net
+  parentRefs:
+    - name: consul
+      sectionName: https
+  rules:
+    - backendRefs:
+        - name: consul-consul-ui
+          port: 80
+      matches:
+        - path:
+            type: PathPrefix
+            value: /