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.

frontend/src/api/privateClient.ts

@@ -1,4 +1,4 @@
-import axios from "axios";
+import axios, { type AxiosRequestConfig } from "axios";
 
 // použij tohle pro API vyžadující autentizaci
 export const privateApi = axios.create({
@@ -25,3 +25,11 @@ privateApi.interceptors.response.use(
     return Promise.reject(error);
   }
 );
+
+
+export const privateMutator = async <T>(
+  config: AxiosRequestConfig
+): Promise<T> => {
+  const response = await privateApi.request<T>(config);
+  return response.data;
+};