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>

apps/base/purelb/kustomization.yaml

@@ -0,0 +1,8 @@
+---
+apiVersion: kustomize.config.k8s.io/v1beta1
+kind: Kustomization
+
+resources:
+  - namespace.yaml
+  - lbnodeagents.yaml
+  - servicegroups.yaml

apps/base/purelb/lbnodeagents.yaml

@@ -0,0 +1,28 @@
+---
+apiVersion: purelb.io/v1
+kind: LBNodeAgent
+metadata:
+  labels:
+    app.kubernetes.io/component: lbnodeagent
+    app.kubernetes.io/name: purelb
+  name: common
+  namespace: purelb
+spec:
+  local:
+    extlbint: kube-lb0
+    localint: default
+    sendgarp: false
+---
+apiVersion: purelb.io/v1
+kind: LBNodeAgent
+metadata:
+  labels:
+    app.kubernetes.io/component: lbnodeagent
+    app.kubernetes.io/name: purelb
+  name: dmz
+  namespace: purelb
+spec:
+  local:
+    extlbint: kube-lb0
+    localint: default
+    sendgarp: false

apps/base/purelb/namespace.yaml

@@ -0,0 +1,7 @@
+---
+apiVersion: v1
+kind: Namespace
+metadata:
+  labels:
+    app.kubernetes.io/name: purelb
+  name: purelb

apps/base/purelb/servicegroups.yaml

@@ -0,0 +1,30 @@
+---
+apiVersion: purelb.io/v1
+kind: ServiceGroup
+metadata:
+  labels:
+    app.kubernetes.io/component: servicegroup
+    app.kubernetes.io/name: purelb
+  name: common
+  namespace: purelb
+spec:
+  local:
+    v4pools:
+      - aggregation: /32
+        pool: 198.18.200.0/24
+        subnet: 198.18.200.0/24
+---
+apiVersion: purelb.io/v1
+kind: ServiceGroup
+metadata:
+  labels:
+    app.kubernetes.io/component: servicegroup
+    app.kubernetes.io/name: purelb
+  name: dmz
+  namespace: purelb
+spec:
+  local:
+    v4pools:
+      - aggregation: /32
+        pool: 198.18.199.0/24
+        subnet: 198.18.199.0/24