feat: integrate Stripe payment with bugfixes and active timeout cancellation

- Add Stripe payment provider with Checkout Session flow
- Payment provider abstraction layer (EasyPay + Stripe unified interface)
- Stripe webhook with proper raw body handling and signature verification
- Frontend: Stripe button with URL validation, anti-duplicate click, noopener
- Active timeout cancellation: query platform before expiring, recover paid orders
- Singleton Stripe client, idempotency keys, Math.round for amounts
- Handle async_payment events, return null for unknown webhook events
- Set Checkout Session expires_at aligned with order timeout
- Add cancelPayment to provider interface (Stripe: sessions.expire, EasyPay: no-op)
- Enable stripe in frontend payment type list

vitest.config.ts

@@ -5,7 +5,7 @@ export default defineConfig({
   test: {
     globals: true,
     environment: 'node',
-    exclude: ['**/node_modules/**', '**/third-party/**'],
+    exclude: ['**/node_modules/**', '**/third-party/**', '**/vendor/**'],
   },
   resolve: {
     alias: {