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.

templates/forum/forum-plate-cat.php

@@ -97,7 +97,7 @@ if (is_array($cat_moderator_ids)) {
         </div>
 
         <div class="aksrt-forum-plate-cat__back">
-            <a href="<?php echo esc_url(home_url('/forums/')); ?>">
+            <a href="<?php echo esc_url(aksrt_get_forum_home_url()); ?>">
                 <i class="fas fa-arrow-left"></i> <?php printf(esc_html__('返回%s', 'aksrt'), esc_html($forum_name)); ?>
             </a>
         </div>