REFACTOR(app): migrate to argocd

- Add Kustomize base and prod overlay structure
- Optimize resources for 2GB RAM environment (100Mi/200Mi)
- Add ArgoCD Application manifest
- Remove old k8s manifests (replaced by Kustomize)
- Add comprehensive deployment guide

deploy/k8s/base/service.yaml

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