feat(pay): guest cash purchase with signed cookie unlock (zibll-style)

Allow pay_no_logged_in cash content orders (user_id=0), set aksrt_pay_* cookies
on paid, accept cookie in access state, and expose guest CTA on paywall/box.

templates/parts/resource-download-box.php

@@ -69,6 +69,18 @@ $is_need_vip = $gate_blocked && $gate_code === 'aksrt_need_vip';
 $is_need_purchase = $gate_blocked && $gate_code === 'aksrt_need_purchase';
 // Points unpaid may also surface as need_purchase; treat low balance only after cashier.
 $is_low_credit = false;
+$allow_guest_buy = !is_user_logged_in()
+	&& function_exists('aksrt_allow_guest_content_pay')
+	&& aksrt_allow_guest_content_pay($post_id)
+	&& $pay_modo !== 'points'
+	&& $user_amount > 0
+	&& empty($access['need_vip']);
+// If gate only says login but guest buy allowed for cash posts, convert to purchase CTA.
+if ($is_need_login && $allow_guest_buy) {
+	$is_need_login = false;
+	$is_need_purchase = true;
+	$gate_blocked = true;
+}
 
 // Zibll pay_free_logged_show: free downloads still require login.
 $free_logged_show = !empty($paid_settings['free_logged_show']);