fix(ns): root-qualify WP_* classes after PSR-4 move

Bare WP_REST_Server etc. resolve under AKSRT\* namespaces; prefix with
\ for Balance REST and other type hints / constructors.

src/AKSRT/Forum/CommentService.php

@@ -109,7 +109,7 @@ class CommentService {
     /**
      * Render forum comments HTML for AJAX and initial load.
      *
-     * @param WP_Comment[] $comments    Comments (parents + children mixed).
+     * @param \WP_Comment[] $comments    Comments (parents + children mixed).
      * @param int          $topic_id    Topic post ID.
      * @param int          $adopted_id  Adopted comment ID (0 if none).
      */
@@ -366,7 +366,7 @@ class CommentService {
      * @param bool   $author_only  Only show post-author replies.
      * @param int    $page      Page number.
      * @param int    $per_page  Items per page.
-     * @return array{comments:WP_Comment[],total:int,max_pages:int,page:int,adopted_id:int}
+     * @return array{comments:\WP_Comment[],total:int,max_pages:int,page:int,adopted_id:int}
      */
     public function get_forum_comments(int $topic_id, string $sort = 'newest', bool $author_only = false, int $page = 1, int $per_page = 30): array {
         $post = get_post($topic_id);