Refactor Stripe payment handling and order status

Refactored Stripe payment integration to use a dedicated Stripe model for session data, updating the PaymentSerializer accordingly. Renamed Order.Status to Order.OrderStatus for clarity. Updated configuration app to ensure SiteConfiguration singleton is created post-migration. Removed obsolete seed_app_config command from docker-compose. Adjusted frontend API generated files and moved orval config.

docker-compose.yml

@@ -19,7 +19,6 @@ services:
       python manage.py migrate --verbosity 3 --noinput &&
       python manage.py check &&
       python manage.py collectstatic --clear --noinput --verbosity 3 &&
-      python manage.py seed_app_config &&
       gunicorn -k uvicorn.workers.UvicornWorker vontor_cz.asgi:application --bind 0.0.0.0:8000"
     ports:
       - "8000:8000"