refactor: simplify k8s deployment to pure kubectl

- Remove kustomization.yaml and all kustomize references
- Remove deploy-pi.sh and vpa-pi-helper.sh helper scripts
- Remove redundant ConfigMap from vpa.yaml
- Update README.md to focus on standard kubectl commands
- Keep deployment simple with just YAML files and kubectl
- Maintain Pi 5 optimizations and VPA functionality
- No complex tooling required for deployment

k8s/service.yaml

@@ -0,0 +1,16 @@
+apiVersion: v1
+kind: Service
+metadata:
+  name: unitforge
+  labels:
+    app: unitforge
+    component: webapp
+spec:
+  type: ClusterIP
+  ports:
+    - name: http
+      port: 8000
+      targetPort: http
+      protocol: TCP
+  selector:
+    app: unitforge