feat(widgets): forum tabs shared hot payload + terms/boards ajax

Route multi-tab forum topics through HotTopics mini/rank payload and
WidgetAjax style/plate params; wire terms/boards to real REST ajaxpager.

src/AKSRT/Widgets/WidgetForumBoardList.php

@@ -140,7 +140,10 @@ class WidgetForumBoardList extends \WP_Widget {
 
 		echo $args['before_widget']; // phpcs:ignore WordPress.Security.EscapeOutput.OutputNotEscaped
 		echo $args['before_title'] . esc_html($title) . $args['after_title']; // phpcs:ignore WordPress.Security.EscapeOutput.OutputNotEscaped
+		$rest = rest_url('aksrt/v1/widgets/forum-boards');
+		echo '<div class="ajaxpager" data-aksrt-ajaxpager data-aksrt-ajax-url="' . esc_url($rest) . '">';
 		echo $html; // phpcs:ignore WordPress.Security.EscapeOutput.OutputNotEscaped
+		echo '</div>';
 		echo $args['after_widget']; // phpcs:ignore WordPress.Security.EscapeOutput.OutputNotEscaped
 	}