fix(payment): re-pay with fresh provider out_trade_no

WeChat/Alipay/Epay reject reusing the same merchant order number when
params change. Allocate attempt-suffixed out_trade_no on resume pay,
map callbacks back to the local order, and best-effort close prior trades.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

src/AKSRT/Payment/UserOrders.php

@@ -337,6 +337,26 @@ class UserOrders {
 
         try {
             $order['subject'] = $order['subject'] ?? sprintf(__('订单 %s', 'aksrt'), $order_number);
+
+            $needs_attempt = !in_array($payment_method, ['balance', 'points'], true);
+            if ($needs_attempt) {
+                $attempt = $repo->allocate_payment_attempt($order_number);
+                if ($attempt === null) {
+                    return ['success' => false, 'message' => __('无法生成支付单号，请稍后重试。', 'aksrt')];
+                }
+                $order = $repo->get_user_order($user_id, $order_number) ?: $order;
+                $order['out_trade_no'] = (string) $attempt['out_trade_no'];
+                if (!empty($attempt['previous'])
+                    && $attempt['previous'] !== $attempt['out_trade_no']
+                    && method_exists($gateway, 'close_trade')) {
+                    try {
+                        $gateway->close_trade((string) $attempt['previous']);
+                    } catch (\Throwable $e) {
+                        // best-effort
+                    }
+                }
+            }
+
             $payment_result = $gateway->create_payment($order);
             if (empty($payment_result['success'])) {
                 return ['success' => false, 'message' => $payment_result['message'] ?? __('支付失败。', 'aksrt')];