fix(db): correct $wpdb->prepare usage in forum board and API audit

- Bind _aksrt_moderators with %s in get_user_managed_plates (stops 4× user-home notices)
- Guard API audit COUNT when no filter values (credits pattern)

inc/classes/forum/board-service-traits/trait-aksrt-forum-board-service-part-2.php

@@ -699,7 +699,8 @@ trait AKSRT_Forum_Board_Service_Part_2 {
         $mod_plate_ids = $wpdb->get_col($wpdb->prepare(
             "SELECT pm.post_id FROM {$wpdb->postmeta} pm
              INNER JOIN {$wpdb->posts} p ON p.ID = pm.post_id AND p.post_type = 'aksrt_forum_plate' AND p.post_status = 'publish'
-             WHERE pm.meta_key = '_aksrt_moderators'",
+             WHERE pm.meta_key = %s",
+            '_aksrt_moderators'
         ));
 
         foreach ($mod_plate_ids as $plate_id) {