feat(forum): frontend 1:1 list/tabs/urls/enqueue

Wire Zibll-style board sort tabs, shared topic rows, page-template
URLs, forum asset enqueue on home/plate, home synthesis load-more,
and topic last_reply meta for last-reply ordering. No dual-read.

inc/classes/forum/class-aksrt-forum-comment-service.php

@@ -34,6 +34,10 @@ class AKSRT_Forum_Comment_Service {
         if ((int) $comment->comment_approved !== 1) return;
         $commenter_id = (int) $comment->user_id;
         if ($commenter_id <= 0) return;
+
+        // Topic-level last_reply for board sort tabs.
+        update_post_meta((int) $post->ID, '_aksrt_last_reply', (string) $comment->comment_date);
+
         $this->forum->notify_topic_reply((int) $post->ID, $commenter_id);
     }