chore: rename nginx service to proxy

docs/operations.md

@@ -5,7 +5,7 @@
 ```bash
 docker compose up --build -d
 docker compose ps
-docker compose logs -f nginx backend frontend postgres
+docker compose logs -f proxy backend frontend postgres
 docker compose down
 ```
 

docs/runbook.md

@@ -33,9 +33,9 @@
 
 1. Confirm the request host is exactly `azionelab.org`; unknown hosts intentionally
    receive 404.
-2. Run `docker compose exec nginx nginx -t`.
+2. Run `docker compose exec proxy nginx -t`.
 3. Check `docker compose ps` and verify both backend and frontend are healthy.
-4. Inspect `docker compose logs --tail=200 nginx backend frontend`.
+4. Inspect `docker compose logs --tail=200 proxy backend frontend`.
 5. Verify local DNS or `/etc/hosts` maps `azionelab.org` to the proxy address.
 
 ## Rollback

docs/testing.md

@@ -8,7 +8,7 @@ All tests should run inside Docker containers.
 docker compose run --rm backend python manage.py test
 docker compose run --rm frontend npm run check
 docker compose run --rm frontend npm run build
-docker compose run --rm nginx nginx -t
+docker compose run --rm proxy nginx -t
 docker compose config --quiet
 ```