feat: add trading platform K8s deployment infrastructure
- Add Helm chart with 19 templates (Deployments, Services, Ingress,
ConfigMaps, Secrets, NetworkPolicy, cert-manager)
- Add Dockerfiles for 4 microservices (dashboard, data-service,
execute-service, news-service)
- Add CI/CD workflows (build-test, build-push, deploy)
- Add raw K8s manifests, per-service Helm charts, and deploy scripts
- Add SOPS-encrypted secrets template and config
- Configure deployment to customer1 namespace
- Include infrastructure components: PostgreSQL, Redis, Kafka