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-compose.php

@@ -74,7 +74,7 @@ $initial_content = $draft_data ? $draft_data['content'] : '';
                     ?>
                 </p>
             </div>
-            <a href="<?php echo esc_url(home_url('/forums/')); ?>" class="aksrt-forum-compose__back">
+            <a href="<?php echo esc_url(aksrt_get_forum_home_url()); ?>" class="aksrt-forum-compose__back">
                 <i class="fas fa-arrow-left"></i> <?php printf(esc_html__('返回%s', 'aksrt'), esc_html($forum_name)); ?>
             </a>
         </div>