Fix HelmRepository API version

- Change from v1beta2 to v1 (v1beta2 is deprecated)
- Resolves dry-run failure in monitoring Kustomization

Co-Authored-By: Claude Haiku 4.5 <noreply@anthropic.com>

apps/monitoring/helm-repos.yaml

@@ -1,4 +1,4 @@
-apiVersion: source.toolkit.fluxcd.io/v1beta2
+apiVersion: source.toolkit.fluxcd.io/v1
 kind: HelmRepository
 metadata:
   name: prometheus-community
@@ -8,7 +8,7 @@ spec:
   url: https://prometheus-community.github.io/helm-charts
 
 ---
-apiVersion: source.toolkit.fluxcd.io/v1beta2
+apiVersion: source.toolkit.fluxcd.io/v1
 kind: HelmRepository
 metadata:
   name: grafana