feat(pangolin): Add Kubernetes controller manifests

Create complete manifest set for Pangolin controller deployment:
- RBAC with ServiceAccount, ClusterRole, and ClusterRoleBinding
- ConfigMap with controller configuration (endpoint, namespace, leader election)
- Deployment with resource limits, health probes, and security context
- Service for metrics endpoint on port 8080

Controller will manage Traefik CRDs (IngressRoute, Middleware, TraefikService)
and sync configuration from Pangolin API.

Relates to DEV-397

Co-Authored-By: Paperclip <noreply@paperclip.ing>

apps/pangolin/kube-controller/configmap.yaml

@@ -0,0 +1,10 @@
+apiVersion: v1
+kind: ConfigMap
+metadata:
+  name: pangolin-controller-config
+  namespace: pangolin
+data:
+  CONFIG_ENDPOINT: "http://pangolin.pangolin.svc.cluster.local:3001/api/v1/traefik-config"
+  TARGET_NAMESPACE: "pangolin"
+  ENABLE_LEADER_ELECTION: "true"
+  LOG_LEVEL: "info"

apps/pangolin/kube-controller/deployment.yaml

@@ -0,0 +1,65 @@
+apiVersion: apps/v1
+kind: Deployment
+metadata:
+  name: pangolin-controller
+  namespace: pangolin
+  labels:
+    app: pangolin-controller
+    component: controller
+spec:
+  replicas: 1
+  selector:
+    matchLabels:
+      app: pangolin-controller
+      component: controller
+  template:
+    metadata:
+      labels:
+        app: pangolin-controller
+        component: controller
+    spec:
+      serviceAccountName: pangolin-controller
+      containers:
+        - name: controller
+          image: fosrl/pangolin-kube-controller:latest
+          imagePullPolicy: Always
+          envFrom:
+            - configMapRef:
+                name: pangolin-controller-config
+          ports:
+            - name: metrics
+              containerPort: 8080
+              protocol: TCP
+          resources:
+            requests:
+              cpu: 100m
+              memory: 128Mi
+            limits:
+              cpu: 500m
+              memory: 512Mi
+          livenessProbe:
+            httpGet:
+              path: /healthz
+              port: 8080
+            initialDelaySeconds: 15
+            periodSeconds: 20
+            timeoutSeconds: 5
+            failureThreshold: 3
+          readinessProbe:
+            httpGet:
+              path: /readyz
+              port: 8080
+            initialDelaySeconds: 5
+            periodSeconds: 10
+            timeoutSeconds: 5
+            failureThreshold: 3
+          securityContext:
+            allowPrivilegeEscalation: false
+            runAsNonRoot: true
+            capabilities:
+              drop:
+                - ALL
+      securityContext:
+        runAsNonRoot: true
+        seccompProfile:
+          type: RuntimeDefault

apps/pangolin/kube-controller/rbac.yaml

@@ -0,0 +1,57 @@
+apiVersion: v1
+kind: ServiceAccount
+metadata:
+  name: pangolin-controller
+  namespace: pangolin
+---
+apiVersion: rbac.authorization.k8s.io/v1
+kind: ClusterRole
+metadata:
+  name: pangolin-controller
+rules:
+  # Traefik CRDs - full CRUD
+  - apiGroups:
+      - traefik.containo.us
+      - traefik.io
+    resources:
+      - ingressroutes
+      - middlewares
+      - traefikservices
+    verbs:
+      - get
+      - list
+      - watch
+      - create
+      - update
+      - patch
+      - delete
+  # Leases for leader election
+  - apiGroups:
+      - coordination.k8s.io
+    resources:
+      - leases
+    verbs:
+      - get
+      - create
+      - update
+  # Events for logging
+  - apiGroups:
+      - ""
+    resources:
+      - events
+    verbs:
+      - create
+      - patch
+---
+apiVersion: rbac.authorization.k8s.io/v1
+kind: ClusterRoleBinding
+metadata:
+  name: pangolin-controller
+roleRef:
+  apiGroup: rbac.authorization.k8s.io
+  kind: ClusterRole
+  name: pangolin-controller
+subjects:
+  - kind: ServiceAccount
+    name: pangolin-controller
+    namespace: pangolin

apps/pangolin/kube-controller/service.yaml

@@ -0,0 +1,18 @@
+apiVersion: v1
+kind: Service
+metadata:
+  name: pangolin-controller-metrics
+  namespace: pangolin
+  labels:
+    app: pangolin-controller
+    component: controller
+spec:
+  type: ClusterIP
+  ports:
+    - name: metrics
+      port: 8080
+      targetPort: 8080
+      protocol: TCP
+  selector:
+    app: pangolin-controller
+    component: controller