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/Core/ScriptsPart1b.php

@@ -279,6 +279,8 @@ trait ScriptsPart1b {
 
         // 举报脚本：举报入口渲染于文章页 meta 菜单、评论区与用户主页/个人中心，
         // 因此 singular 页面与 profile 路由都需要加载（文章页举报按钮此前无脚本支撑）。
+        // 禁封脚本：禁封入口渲染于用户主页封面三点菜单、评论区三点菜单与文章
+        // 作者栏三点菜单，与举报脚本同一组页面，合并加载。
         if (is_singular() || $is_profile_page) {
             $report_js_path = get_template_directory() . '/assets/js/report.js';
             if (file_exists($report_js_path)) {
@@ -290,6 +292,16 @@ trait ScriptsPart1b {
                     true
                 );
             }
+            $user_ban_js_path = get_template_directory() . '/assets/js/user-ban.js';
+            if (file_exists($user_ban_js_path)) {
+                wp_enqueue_script(
+                    'aksrt-user-ban',
+                    $base_uri . '/assets/js/user-ban.js',
+                    ['loader_js'],
+                    filemtime($user_ban_js_path) ?: $version,
+                    true
+                );
+            }
         }
 
         // 用户中心 / 公开主页：路由专属 CSS