feat(infra): add hub service — Docker, Traefik, CI/CD
- Add infra/docker/hub.Dockerfile (Next.js multi-stage build)
- Add infra/compose/hub.yml with app-shared-net
- Add Traefik route for hub.asepharyana.{my,web}.id → hub:3000
- Update docker-build-push.yml: path detection, matrix build, dispatch, manifest
- Update deploy-docker.yml: include hub.yml in ALL_COMPOSE_FILES
- Update update-submodule.yml: allow hub service
- Update docs/ARCHITECTURE.md
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
