avoid coolify host-port collisions by exposing app port internally

README.md

@@ -33,7 +33,8 @@ cp .env.example .env
 docker compose up --build -d
 ```
 
-Default app URL: `http://localhost:3000` (override with `APP_PORT` in `.env`).
+For local Docker, host port mapping comes from `docker-compose.override.yml` (default `http://localhost:3000`, configurable via `APP_PORT`).
+For Coolify/remote Docker Compose, only container port `3000` is exposed internally (no fixed host port bind), avoiding host port collisions.
 Runtime data persists in the `app_data` volume (`/app/data` in container).
 
 ## Environment