feat(user-ban): frontend ban modal replaces the backend restrictions tab

1:1 replicate the reference theme user-ban flow on the frontend:

- Ban/unban modal rendered by inc/helpers/user-ban.php, opened via
  AksrtModalRuntime.openRemote (600px desktop dialog, 360px initial
  height, mobile bottom drawer, c-yellow colorful unban header).
- Three entry points wired: user homepage cover three-dot menu,
  comment section menu, article author card menu (ban item takes
  priority over report, matching the reference hook order).
- REST endpoints /user-ban/modal and /user-ban/set under aksrt/v1,
  guarded by check_permission, persisted through User\Restriction.
- Submit semantics match zib_ajax_set_user_ban: ban reloads the page,
  unban only closes the modal.

Cleanup (no dual-track): the backend ban-restrictions tab, its form
handlers and flash keys are removed; ticket processing links to the
frontend user homepage as the reference theme does; admin/report and
appeal notification URLs move to type/status query args.

Verification: 337/337 widget-system contract tests, 41/41 admin and
front-submit tests, php -l clean on all changed PHP files.

src/Admin/Native/UsersMenusTickets.php

@@ -477,7 +477,9 @@ trait UsersMenusTickets {
                 if (class_exists('\AKSRT\User\Restriction') && \AKSRT\User\Restriction::get_instance()->is_restricted($target_id)) {
                     echo $this->ticket_ban_info_html($target_id);
                 } else {
-                    $ban_url = admin_url('users.php?page=aksrt_user_ban&tab=restrictions&user_id=' . $target_id);
+                    // 与参考主题一致：跳转到前台该用户公开主页，经封面右下角三点
+                    // 菜单的「禁封此用户」打开封禁弹窗完成处理（后台不提供禁封表单）。
+                    $ban_url = function_exists('aksrt_get_user_home_url') ? aksrt_get_user_home_url($target_id) : get_author_posts_url($target_id);
                     echo '<div style="color:#16a60a;">' . esc_html__('用户状态正常', 'aksrt') . '</div>';
                     echo '<p class="description">' . esc_html__('请查阅相关资料以及举证，如举报事实清楚，可以', 'aksrt');
                     echo ' <a target="_blank" href="' . esc_url($ban_url) . '">' . esc_html__('点击此处', 'aksrt') . '</a> ';