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

src/lib/order/status.ts

@@ -1,10 +1,4 @@
-export type RechargeStatus =
-  | 'not_paid'
-  | 'paid_pending'
-  | 'recharging'
-  | 'success'
-  | 'failed'
-  | 'closed';
+export type RechargeStatus = 'not_paid' | 'paid_pending' | 'recharging' | 'success' | 'failed' | 'closed';
 
 export interface OrderStatusLike {
   status: string;
@@ -12,13 +6,7 @@ export interface OrderStatusLike {
   completedAt?: Date | string | null;
 }
 
-const CLOSED_STATUSES = new Set([
-  'EXPIRED',
-  'CANCELLED',
-  'REFUNDING',
-  'REFUNDED',
-  'REFUND_FAILED',
-]);
+const CLOSED_STATUSES = new Set(['EXPIRED', 'CANCELLED', 'REFUNDING', 'REFUNDED', 'REFUND_FAILED']);
 
 const REFUND_STATUSES = new Set(['REFUNDING', 'REFUNDED', 'REFUND_FAILED']);