feat(users): add inline promotion center

inc/helpers/user-center-renderers/profile-promotion.php

@@ -0,0 +1,22 @@
+<?php
+/**
+ * User center promotion panel shell.
+ *
+ * @package AKSRT
+ */
+
+defined('ABSPATH') || exit;
+
+$context = is_array($args['context'] ?? null) ? $args['context'] : [];
+extract($context, EXTR_SKIP); // phpcs:ignore WordPress.PHP.DontExtract.extract_extract
+?>
+<section class="uc-promotion-panel" aria-labelledby="uc-promotion-title">
+	<header class="uc-promotion-panel__header">
+		<span class="uc-promotion-panel__icon"><i class="fas fa-user-plus" aria-hidden="true"></i></span>
+		<div>
+			<p class="uc-promotion-panel__eyebrow"><?php esc_html_e('邀请与奖励', 'aksrt'); ?></p>
+			<h2 id="uc-promotion-title"><?php esc_html_e('推广中心', 'aksrt'); ?></h2>
+		</div>
+	</header>
+	<p class="uc-promotion-panel__intro"><?php esc_html_e('在这里分享专属邀请链接并查看推广成果。', 'aksrt'); ?></p>
+</section>