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

assets/css/routes/user-center/shell.css

@@ -715,6 +715,7 @@ body.aksrt-user-center .uc-content,
 
 .uc-service-grid__item--cart .uc-service-grid__icon { color: #dd6941; background: rgba(238, 109, 61, 0.12); }
 .uc-service-grid__item--level .uc-service-grid__icon { color: #9b6b0a; background: rgba(234, 179, 8, 0.13); }
+.uc-service-grid__item--promotion .uc-service-grid__icon { color: #b8377d; background: rgba(219, 39, 119, 0.12); }
 .uc-service-grid__item--auth .uc-service-grid__icon { color: #287bc4; background: rgba(14, 165, 233, 0.12); }
 .uc-service-grid__item--orders .uc-service-grid__icon { color: #c05621; background: rgba(234, 88, 12, 0.12); }
 .uc-service-grid__item--notice .uc-service-grid__icon { color: #d04b65; background: rgba(244, 63, 94, 0.11); }