Add NATS deployment and service configuration, integrate environment variables, and update server to support NATS and Redis connections.

k8s/app.yaml

@@ -22,6 +22,11 @@ spec:
         - containerPort: 8080
           name: http
           protocol: TCP
+        env:
+        - name: REDIS_ADDR
+          value: "redis-service:6379"
+        - name: NATS_URL
+          value: "nats://nats-service:4222"
         livenessProbe:
           httpGet:
             path: /health