refactor(resource): drop aksrt_resource CPT residue, post+meta only

inc/classes/class-aksrt-seo-head.php

@@ -95,7 +95,7 @@ class AKSRT_SEO_Head {
             if ($post instanceof WP_Post) {
                 $payload['object'] = $post;
                 $payload['canonical'] = (string) get_permalink($post);
-                $payload['og_type'] = in_array($post->post_type, ['post', 'aksrt_resource'], true) ? 'article' : 'website';
+                $payload['og_type'] = ($post->post_type === 'post') ? 'article' : 'website';
 
                 // 单篇 SEO 覆盖：per-post meta → 文章字段 → 站点默认。
                 $meta = $this->post_seo_meta($post->ID);