chore(compose): sync example env with codebase

Add NODE_ENV (used by config/db.js and controllers/auth.js
to switch MONGO_URI/MONGO_DEV_URI and secure cookies).

Drop PATH, BUN_RUNTIME_TRANSPILER_CACHE_PATH, and
BUN_INSTALL_BIN leaked from container runtime env; they are
not read by the app.

Drop JWT_EXPIRES duplicate; app reads JWT_EXPIRE
(models/User.js expiresIn), matching .env.

Restore SECURE=false default (used by utils/sendEmail.js
via yn(Bun.env.SECURE)).

Keep list aligned with Dockerfile and .env keys so the
example stays a valid template for server deployments.

docker-compose.example.yml

@@ -6,8 +6,8 @@ services:
     container_name: games-api
     environment:
       - ACCESS_TOKEN_SECRET=
-      - JWT_EXPIRE=
       - REFRESH_TOKEN_SECRET=
+      - JWT_EXPIRE=
       - MONGO_URI=
       - SMTP_HOST=
       - SMTP_PORT=
@@ -16,6 +16,6 @@ services:
       - FROM_EMAIL=
       - FROM_NAME=
       - SECURE=false
+      - NODE_ENV=
     ports:
       - 5000:5000
-