优化文章seo声明；导出面板新增版权声明功能；

app/common/tools/PostBlock.php

@@ -0,0 +1,16 @@
+<?php
+
+namespace app\common\tools;
+
+use think\facade\View;
+
+class PostBlock
+{
+    public static function  copyright($model_post)
+    {
+
+        return View::fetch(__DIR__ . '/post_block/copyright.html', [
+            'post' => $model_post
+        ]);
+    }
+}