feat: migrate purelb to ArgoCD

Migrate PureLB load balancer from Terragrunt to ArgoCD/Kustomize.
Deploys purelb v0.13.0 with two LBNodeAgent and two ServiceGroup CRs
(common: 198.18.200.0/24, dmz: 198.18.199.0/24).
Adds LBNodeAgent and ServiceGroup to kubeconform skip list (no CRD catalog schema).

💘 Generated with Crush

Assisted-by: Claude Sonnet 4.6 via Crush <crush@charm.land>

argocd/applicationsets/platform.yaml

@@ -20,6 +20,7 @@ spec:
       - path: apps/overlays/*/jfrog
       - path: apps/overlays/*/node-feature-discovery
       - path: apps/overlays/*/puppet
+      - path: apps/overlays/*/purelb
       - path: apps/overlays/*/reflector-system
       - path: apps/overlays/*/reloader-system
       - path: apps/overlays/*/reposync

argocd/projects/platform.yaml

@@ -10,6 +10,7 @@ spec:
     - https://git.unkin.net/unkin/argocd-apps
     - https://charts.jetstack.io
     - https://cloudnative-pg.github.io/charts
+    - https://gitlab.com/api/v4/projects/20400619/packages/helm/stable
     - https://intel.github.io/helm-charts/
     - https://kubernetes-sigs.github.io/external-dns/
     - https://releases.rancher.com/server-charts/stable
@@ -31,6 +32,8 @@ spec:
       server: https://kubernetes.default.svc
     - namespace: 'node-feature-discovery'
       server: https://kubernetes.default.svc
+    - namespace: 'purelb'
+      server: https://kubernetes.default.svc
     - namespace: 'puppet'
       server: https://kubernetes.default.svc
     - namespace: 'reposync'
@@ -52,6 +55,8 @@ spec:
       kind: ValidatingWebhookConfiguration
     - group: 'scheduling.k8s.io'
       kind: PriorityClass
+    - group: 'purelb.io'
+      kind: '*'
     - group: 'nfd.k8s-sigs.io'
       kind: NodeFeatureRule
     - group: 'deviceplugin.intel.com'