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/profile-sidebar.php

@@ -11,7 +11,6 @@ $context = is_array($args['context'] ?? null) ? $args['context'] : [];
 extract($context, EXTR_SKIP); // phpcs:ignore WordPress.PHP.DontExtract.extract_extract
 
 require __DIR__ . '/sidebar-stats.php';
-require __DIR__ . '/sidebar-orders.php';
 require __DIR__ . '/sidebar-commerce.php';
 require __DIR__ . '/sidebar-creator.php';
 require __DIR__ . '/sidebar-nav.php';