feat: migrate payment provider to easy-pay, add order history and refund support

- Replace zpay with easy-pay payment provider (new lib/easy-pay/ module)
- Add order history page for users (pay/orders)
- Add GET /api/orders/my endpoint to list user's own orders
- Add GET /api/users/[id] endpoint for sub2api user lookup
- Add order status tracking module (lib/order/status.ts)
- Update config to support easy-pay credentials (merchant ID, key, gateway)
- Update PaymentForm and PaymentQRCode components for easy-pay flow
- Update pay page and admin page with new order management UI
- Update order service to support easy-pay, cancellation, and refund

src/lib/order/timeout.ts

@@ -0,0 +1,42 @@
+import { prisma } from '@/lib/db';
+
+const INTERVAL_MS = 30_000; // 30 seconds
+let timer: ReturnType<typeof setInterval> | null = null;
+
+export async function expireOrders(): Promise<number> {
+  const result = await prisma.order.updateMany({
+    where: {
+      status: 'PENDING',
+      expiresAt: { lt: new Date() },
+    },
+    data: { status: 'EXPIRED' },
+  });
+
+  if (result.count > 0) {
+    console.log(`Expired ${result.count} orders`);
+  }
+
+  return result.count;
+}
+
+export function startTimeoutScheduler(): void {
+  if (timer) return;
+
+  // Run immediately on startup
+  expireOrders().catch(console.error);
+
+  // Then run every 30 seconds
+  timer = setInterval(() => {
+    expireOrders().catch(console.error);
+  }, INTERVAL_MS);
+
+  console.log('Order timeout scheduler started');
+}
+
+export function stopTimeoutScheduler(): void {
+  if (timer) {
+    clearInterval(timer);
+    timer = null;
+    console.log('Order timeout scheduler stopped');
+  }
+}