fix(vip): preserve layered membership expirations

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

inc/helpers/user-center-renderers/vip-tab.php

@@ -30,6 +30,8 @@ if (class_exists('\\AKSRT\\Content\\VipService')) {
 	$currency_name = (string) ($vip_catalog['currency_name'] ?? $currency_name);
 }
 $expires = (int) get_user_meta($user_id, 'aksrt_vip_expires', true);
+$base_level = (int) get_user_meta($user_id, 'aksrt_vip_base_level', true);
+$base_expires = (int) get_user_meta($user_id, 'aksrt_vip_base_expires', true);
 $expired_level = (int) get_user_meta($user_id, 'aksrt_vip_level_expired', true);
 $levels = is_array($vip_settings['levels'] ?? null) ? $vip_settings['levels'] : [];
 $desc_top = (string) ($vip_settings['desc'] ?? '');
@@ -62,7 +64,14 @@ if ($level > 0) {
 		$vip_state       = 'active';
 		$vip_state_label = __('生效中', 'aksrt');
 		$vip_expiry_text = sprintf(__('到期时间：%s', 'aksrt'), wp_date('Y年m月d日', $expires));
-		$btn_type        = 'renew_' . $level;
+		if ($base_level > 0 && $base_level < $level) {
+			$base_name = (string) ($levels[$base_level]['name'] ?? ('VIP' . $base_level));
+			$base_expiry_text = $base_expires > 0
+				? wp_date('Y年m月d日', $base_expires)
+				: __('永久', 'aksrt');
+			$vip_expiry_text .= '；' . sprintf(__('%s：%s', 'aksrt'), $base_name, $base_expiry_text);
+		}
+		$btn_type       = 'renew_' . $level;
 	}
 } elseif ($expired_level > 0) {
 	$vip_state        = 'expired';