feat(user-center): promote invite into standalone 推广中心 tab

Register a dedicated `promotion` dashboard panel gated by the existing
invite switches (credits + invite reward + invite registration), and move
the invite card out of the revenue tab so 收益中心 is pure earnings/withdrawal.

- src/User/Center.php: register promotion panel; revenue no longer depends
  on invite being on
- inc/helpers/user-center-renderers/profile-promotion.php: new panel body
  hosting the existing [data-aksrt-invite] card
- profile-revenue.php: drop the invite section; aksrt-user-center.php: drop
  unused show_invite_section context, add promotion to built-in tabs + view map
- repoint invite/promotion deep-link aliases from revenue to promotion across
  tab-url builder, tab resolver, runtime tabAliases, urls.php, and the
  revenue-JS enqueue gate
- sidebar-nav.php: add 推广中心 service entry; shell.css: entry icon color;
  sidebar-creator.php: reword revenue card
- UserRuntime.php: allow promotion in configurable tabs

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

@@ -28,7 +28,7 @@ if ($creation_url === '' && $revenue_url === '') {
 	<?php if ($revenue_url !== '') : ?>
 		<a class="uc-center-card uc-center-card--revenue" href="<?php echo esc_url($revenue_url); ?>">
 			<span class="uc-center-card__icon"><i class="fas fa-chart-line" aria-hidden="true"></i></span>
-			<span><strong><?php esc_html_e('收益中心', 'aksrt'); ?></strong><small><?php esc_html_e('邀请、返佣与收益', 'aksrt'); ?></small></span>
+			<span><strong><?php esc_html_e('收益中心', 'aksrt'); ?></strong><small><?php esc_html_e('返佣与收益提现', 'aksrt'); ?></small></span>
 			<i class="fas fa-angle-right" aria-hidden="true"></i>
 		</a>
 	<?php endif; ?>