feat(ticket): record urges in thread, show urge count in admin, mail admins

- aksrt_ticket gains urge_count / last_urge_time (schema 3.1.0)
- cooldown moves from transient to an atomic conditional UPDATE
- urge inserts a system reply rendered as a centered notice (not quotable)
- admin list badge + info card row for urge count / last time
- new ticket_urge_admin mail event via aksrt_ticket_urged

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

src/Admin/Native/UsersMenusTicketsList.php

@@ -217,7 +217,7 @@ trait UsersMenusTicketsList {
 
         printf(
             '<tr id="aksrt-ticket-%1$d" class="aksrt-tickets-admin__row%2$s">'
-            . '<td class="column-title"><a class="row-title" href="%3$s" aria-expanded="%4$s">%5$s</a>'
+            . '<td class="column-title"><a class="row-title" href="%3$s" aria-expanded="%4$s">%5$s</a>%15$s'
             . '<div class="aksrt-tickets-admin__sub"><code>%6$s</code>%7$s</div></td>'
             . '<td class="column-status"><span class="aksrt-ticket-badge" style="--aksrt-ticket-color:%8$s">%9$s</span></td>'
             . '<td class="column-type">%10$s</td>'
@@ -245,7 +245,8 @@ trait UsersMenusTicketsList {
                 /* translators: %s submit time */
                 __('提交于 %s', 'aksrt'),
                 (string) $ticket['post_time']
-            ))
+            )),
+            $this->ticket_urge_badge($ticket) // phpcs:ignore WordPress.Security.EscapeOutput.OutputNotEscaped
         );
 
         if ($is_open) {
@@ -253,6 +254,23 @@ trait UsersMenusTicketsList {
         }
     }
 
+    /** 催单徽标：次数 + 悬停显示最近催单时间；已完结或未催过不输出。 */
+    private function ticket_urge_badge(array $ticket): string {
+        $count = (int) ($ticket['urge_count'] ?? 0);
+        if ($count <= 0 || !empty($ticket['is_closed'])) {
+            return '';
+        }
+        return ' <span class="aksrt-ticket-urge" title="' . esc_attr(sprintf(
+            /* translators: %s last urge time */
+            __('最近催单：%s', 'aksrt'),
+            (string) $ticket['last_urge_time']
+        )) . '">' . esc_html(sprintf(
+            /* translators: %d urge count */
+            __('催单 ×%d', 'aksrt'),
+            $count
+        )) . '</span>';
+    }
+
     /** 头像 + 名称（链接到用户编辑页）。后台不走前台懒加载，直接输出 src。 */
     private function ticket_user_chip(int $user_id, string $name): string {
         $avatar = function_exists('aksrt_get_avatar_url') ? aksrt_get_avatar_url($user_id, 48) : '';