feat(widgets): simplify locations and paid sidebar

Remove deprecated widget locations and widgets, standardize sidebar labels, and render a compact paid-post purchase card in the article sidebar.

src/Widgets/WidgetYiyan.php

@@ -43,7 +43,7 @@ class WidgetYiyan extends \WP_Widget {
 	public function __construct() {
 		parent::__construct(
 			'aksrt_yiyan',
-			__('一言轮播', 'aksrt'),
+			__('AKSRT 一言轮播', 'aksrt'),
 			[
 				'description' => __('显示随机一言/每日语录，支持自动轮播。', 'aksrt'),
 				'classname'   => 'widget_aksrt_yiyan yiyan-box',