iam/
│
├── docker-compose.yml          --- single compose at root
│
├── keycloak/
│   ├── docker-compose.yml      --- (optional, but we’ll merge into root)
│   ├── themes/
│   └── postgres/
│       ├── init.sql
│       └── data/               --- docker volume (optional bind)
│
├── gateway/
│   └── nginx.conf
│
└── services/
    ├── user-service/
    │   ├── Dockerfile
    │   ├── package.json
    │   ├── package-lock.json
    │   └── src/
    │       └── index.js
    │
    └── booking-service/          --- future services