feat: add order lifecycle integration tests (29 tests) and staging K8s deployment manifests
Testing (P0-7):
- 29 functional tests for order-service API (create/pay/complete/cancel lifecycle)
- CustomWebApplicationFactory with InMemory DB, mocked wallet/SignalR/tenant
- TestAuthHandler for JWT auth in tests
- Full lifecycle tests: cash flow and online payment flow end-to-end
Staging Deployment (P0-8):
- K8s manifests for 8 MVP services + Redis + POS web (namespace, configmap, secrets)
- Traefik Ingress with path-based routing and TLS via cert-manager
- HPA auto-scaling (2-4 replicas, CPU/memory thresholds)
- deploy-staging.sh script with --dry-run and --service flags
- CI/CD: deploy-staging.yml and docker-build.yml with matrix strategy
- Consistent patterns: port 8080, 3 health probes, RollingUpdate
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
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