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/orval.config.ts

@@ -0,0 +1,70 @@
+import { defineConfig } from "orval";
+import "dotenv/config";
+
+const backendUrl = process.env.VITE_BACKEND_URL || "http://localhost:8000";
+
+// může se hodit pokud nechceme při buildu generovat klienta (nechat false pro produkci nebo vynechat)
+const SKIP_ORVAL = process.env.SKIP_ORVAL === "true";
+
+if (SKIP_ORVAL) {
+  console.log("[ORVAL] Generation skipped.");
+  process.exit(0);
+}
+
+export default defineConfig({
+  public: {
+    input: { 
+      target: `${backendUrl}/api/schema/`,
+
+      filters: {
+        mode: "include",
+        tags: ["public"],
+      },
+    },
+    output: {
+      target: "api/generated/public.ts",
+      schemas: "api/generated/public/models",
+
+      mode: "tags",
+      clean: true,
+
+      client: "react-query",
+      httpClient: "axios",
+
+      override: {
+        mutator: {
+          path: "api/publicClient.ts", //IMPORTANTE
+          name: "publicMutator",
+        },
+      },
+    },
+    hooks: {
+      afterAllFilesWrite: 'prettier --write',
+    }
+  },
+  private: {
+    input: { 
+      target: `${backendUrl}/api/schema/`,
+    },
+    output: {
+      target: "api/generated/private.ts", //IMPORTANTE
+      schemas: "api/generated/private/models",
+
+      mode: "tags",
+      clean: true,
+      
+      client: "react-query",
+      httpClient: "axios",
+
+      override: {
+        mutator: {
+          path: "api/privateClient.ts",
+          name: "privateMutator",
+        },
+      },
+    },
+    hooks: {
+      afterAllFilesWrite: 'prettier --write',
+    }
+  },
+});