fix(article): add status label in article metadata

Included a "Status:" label in the article metadata section to clearly indicate the publication status. This improves readability and user experience by explicitly naming the metadata field. No functional changes to the data retrieval process.

single-article.php

@@ -19,7 +19,7 @@
                         <strong>DOI:</strong> <?php echo esc_html(get_post_meta(get_the_ID(), 'article_doi', true)); ?>
                     </p>
                     <p class="text-muted">
-                        <?php
+                        <strong>Status:</strong> <?php
                         $terms = get_the_terms(get_the_ID(), 'publication_status');
                         if (!empty($terms) && !is_wp_error($terms)) {
                             $term_list = array();