feat(admin): rebuild ban page to mirror the reference theme

- rename the users.php submenu to 举报&禁封申诉 and the page heading to
  用户禁封申诉及用户举报管理
- merge report tickets and ban appeals into one Zibll-style queue:
  type filter buttons (全部/禁封申诉/用户举报), status subsubsub
  (全部/待处理/已批准/已拒绝), search box, sortable widefat table with
  the same column set (状态/类型/提交用户/详情/提交时间/更新时间),
  inline process forms and 20-per-page pagination
- report process form shows the reported target, restriction status and
  an enforcement action select; appeal form offers approve/reject radios
  with a message to the user
- move restriction enforcement into ReportCenter::apply_action so REST
  and the native page share one implementation; add get_report_row()
- drop the old three-tab rendering (reports/appeals tabs) and fix all
  notice/mail/SPA links to the merged page

src/Settings/MailNotifications.php

@@ -176,7 +176,7 @@ final class MailNotifications {
 
     public static function report_submitted(int $report_id, array $report): void {
         $reporter = get_userdata((int) ($report['reporter_id'] ?? 0));
-        self::send_admin('report_admin', ['username' => $reporter instanceof \WP_User ? $reporter->display_name : __('用户', 'aksrt'), 'title' => (string) ($report['target_type'] ?? ''), 'url' => admin_url('users.php?page=aksrt_user_ban&tab=reports')]);
+        self::send_admin('report_admin', ['username' => $reporter instanceof \WP_User ? $reporter->display_name : __('用户', 'aksrt'), 'title' => (string) ($report['target_type'] ?? ''), 'url' => admin_url('users.php?page=aksrt_user_ban')]);
     }
 
     public static function report_status_changed(int $report_id, int $reporter_id, string $status): void {