docs: align all installation docs with docker-compose.yaml

README.md

@@ -60,13 +60,10 @@ Open:
 ### Docker Compose
 
 ```bash
-cp .env.example .env
-# Edit .env — set DATABASE_URL, REDIS_URL, SECRET_KEY, CORS_ORIGINS
+cp .env.docker.example .env.docker
+# Edit .env.docker — set DB_PASSWORD, REDIS_PASSWORD, SECRET_KEY, APP_DOMAIN
 # Set ENVIRONMENT=production, SESSION_COOKIE_SECURE=true
-docker compose up -d
-
-# Run migrations
-docker compose exec api alembic upgrade head
+docker compose --env-file .env.docker up --build -d
 ```
 
 ### Manual (without Docker)