Add admin panel API with CRUD for apps

- Express.js backend with JWT authentication
- CRUD endpoints for apps management
- Health check endpoint
- Dockerfile per admin API (Node 18 Alpine)
- Kubernetes: admin-api deployment, service, ingress
- Admin panel at http://admin.apps.local
- Updated nginx.conf to route /api to admin API
- Fixed ingress rules for separate web and admin services

backend/k8s/admin-deployment.yaml

@@ -0,0 +1,54 @@
+apiVersion: apps/v1
+kind: Deployment
+metadata:
+  name: admin-api
+  labels:
+    app: admin-api
+spec:
+  replicas: 2
+  selector:
+    matchLabels:
+      app: admin-api
+  template:
+    metadata:
+      labels:
+        app: admin-api
+    spec:
+      containers:
+      - name: admin-api
+        image: admin-api:latest
+        imagePullPolicy: Never
+        ports:
+        - containerPort: 3000
+        env:
+        - name: PORT
+          value: "3000"
+        - name: ADMIN_TOKEN
+          valueFrom:
+            secretKeyRef:
+              name: admin-secrets
+              key: admin-token
+        - name: JWT_SECRET
+          valueFrom:
+            secretKeyRef:
+              name: admin-secrets
+              key: jwt-secret
+        resources:
+          requests:
+            memory: "128Mi"
+            cpu: "100m"
+          limits:
+            memory: "256Mi"
+            cpu: "200m"
+        livenessProbe:
+          httpGet:
+            path: /api/apps
+            port: 3000
+          initialDelaySeconds: 10
+          periodSeconds: 10
+        readinessProbe:
+          httpGet:
+            path: /api/apps
+            port: 3000
+          initialDelaySeconds: 5
+          periodSeconds: 5

backend/k8s/admin-ingress.yaml

@@ -0,0 +1,18 @@
+apiVersion: networking.k8s.io/v1
+kind: Ingress
+metadata:
+  name: admin-api
+  annotations:
+    nginx.ingress.kubernetes.io/rewrite-target: /
+spec:
+  rules:
+  - host: admin.apps.local
+    http:
+      paths:
+      - path: /
+        pathType: Prefix
+        backend:
+          service:
+            name: admin-api
+            port:
+              number: 80

backend/k8s/admin-service.yaml

@@ -0,0 +1,15 @@
+apiVersion: v1
+kind: Service
+metadata:
+  name: admin-api
+  labels:
+    app: admin-api
+spec:
+  type: ClusterIP
+  ports:
+  - port: 80
+    targetPort: 3000
+    protocol: TCP
+    name: http
+  selector:
+    app: admin-api