Add Mollie payment integration: Implement lazy loading for PaymentSuccess page, update CartTab and OrderProcessingService to handle Mollie payment intents, and enhance ProfilePage to manage payment completion for both Stripe and Mollie. Update base URL for development environment.

src/App.js

@@ -55,6 +55,9 @@ const ChatAssistant = lazy(() => import(/* webpackChunkName: "chat" */ "./compon
 const PresseverleihPage = lazy(() => import(/* webpackChunkName: "presseverleih" */ "./pages/PresseverleihPage.js"));
 const ThcTestPage = lazy(() => import(/* webpackChunkName: "thc-test" */ "./pages/ThcTestPage.js"));
 
+// Lazy load payment success page
+const PaymentSuccess = lazy(() => import(/* webpackChunkName: "payment" */ "./components/PaymentSuccess.js"));
+
 // Import theme from separate file to reduce main bundle size
 import defaultTheme from "./theme.js";
 // Lazy load theme customizer for development only
@@ -224,6 +227,9 @@ const AppContent = ({ currentTheme, onThemeChange }) => {
               {/* Profile page */}
               <Route path="/profile" element={<ProfilePageWithSocket />} />
 
+              {/* Payment success page for Mollie redirects */}
+              <Route path="/payment/success" element={<PaymentSuccess />} />
+
               {/* Reset password page */}
               <Route
                 path="/resetPassword"