refactor: move user-center My Orders into My Services section

The standalone order card is folded into the 我的服务 (My Services) sidebar
section: 我的订单 becomes a service-grid tile (all orders), with the
待支付/售后 quick shortcuts rendered beneath it as a compact row. Gated on
the orders dashboard tab being registered so no dead tile appears when the
payment stack is absent.

inc/helpers/user-center-renderers/sidebar-nav.php

@@ -11,6 +11,8 @@ $level_url = isset($dashboard_tabs['level'])
 	? aksrt_get_user_center_tab_url('level')
 	: '';
 $auth_url = isset($dashboard_tabs['auth']) ? aksrt_get_user_center_tab_url('auth') : '';
+$orders_available = isset($dashboard_tabs['orders']);
+$orders_url = $orders_available ? (string) ($orders_url ?? '') : '';
 
 $services = array_values(array_filter([
 	[
@@ -26,6 +28,13 @@ $services = array_values(array_filter([
 		'url'   => $auth_url,
 		'tab'   => 'auth',
 	],
+	[
+		'label' => __('我的订单', 'aksrt'),
+		'icon'  => 'receipt',
+		'tone'  => 'orders',
+		'url'   => $orders_url,
+		'tab'   => 'orders',
+	],
 ], static fn(array $item): bool => (string) $item['url'] !== ''));
 
 $settings = array_values(array_filter([
@@ -70,6 +79,9 @@ $render_grid = static function (array $items): void {
 <div class="uc-sidebar__section">
 	<div class="uc-sidebar__heading"><span><?php esc_html_e('我的服务', 'aksrt'); ?></span></div>
 	<?php $render_grid($services); ?>
+	<?php if ($orders_url !== '') : ?>
+		<?php require __DIR__ . '/sidebar-orders.php'; ?>
+	<?php endif; ?>
 </div>
 <?php endif; ?>