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

docker-compose.prod.yml

@@ -0,0 +1,15 @@
+services:
+  app:
+    image: sub2apipay:latest
+    container_name: sub2apipay
+    ports:
+      - "8087:3000"
+    env_file: .env
+    networks:
+      - sub2api-network
+    restart: unless-stopped
+
+networks:
+  sub2api-network:
+    external: true
+    name: sub2api-star_sub2api-network