Add Kubernetes deployment configurations

- Add deployment.yaml with imagePullSecrets and env configuration
- Add service.yaml with NodePort configuration
- Configure Spring Boot environment variables from ConfigMap and Secrets
- Ensures proper image pull authentication from private registry

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

k8s/service.yaml

@@ -0,0 +1,16 @@
+apiVersion: v1
+kind: Service
+metadata:
+  name: lpt-be
+  namespace: lpt-dev
+  labels:
+    app: lpt-be
+spec:
+  type: NodePort
+  selector:
+    app: lpt-be
+  ports:
+    - port: 8888
+      targetPort: 8888
+      nodePort: 30082
+      protocol: TCP