INIT(deploy): portfolio project setup

Add complete portfolio project including:
- Next.js application in services/nextjs
- Docker configurations for dev and prod
- Kubernetes deployment manifests with kustomize
- ArgoCD application configuration
- GitHub Actions workflow for automated builds

deploy/k8s/base/service.yaml

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