fix(pay): refund wallet on withdraw reject and show pending history

Close the freeze/refund loop when admin rejects a balance withdrawal,
block concurrent open applications, and surface processing state plus
server-rendered withdraw history on the wallet card.

inc/classes/class-aksrt-balance-service.php

@@ -734,6 +734,10 @@ class AKSRT_Balance_Service {
 		if ($account === '') {
 			return new WP_Error('aksrt_withdraw_account', __('请填写收款账号信息', 'aksrt'), ['status' => 400]);
 		}
+		// One open balance withdrawal at a time (Zibll parity).
+		if (AKSRT_Withdrawal::get_instance()->has_open_withdrawal($user_id)) {
+			return new WP_Error('aksrt_withdraw_pending', __('您有处理中的提现申请，请等待完成后再申请', 'aksrt'), ['status' => 409]);
+		}
 		$wallet = AKSRT_Balance::balance($user_id);
 		if ($wallet < $amount) {
 			return new WP_Error('aksrt_balance_insufficient', __('余额不足', 'aksrt'), ['status' => 402]);