fix(comments): align image upload with Zibll

Unify comment image upload settings, REST permissions, preview, progress,
and response handling while removing obsolete compatibility paths.

src/Admin/Schema/SchemaPostList.php

@@ -224,7 +224,8 @@ class SchemaPostList {
                         ]],
                         ['key' => 'toolbar', 'title' => '评论工具栏', 'fields' => [
                             ['key' => 'comment_code', 'label' => '代码插入', 'type' => 'switch', 'default' => true],
-                            ['key' => 'comment_img', 'label' => '图片上传', 'type' => 'switch', 'default' => true],
+                            ['key' => 'comment_img', 'label' => '图片按钮', 'type' => 'switch', 'default' => true],
+                            ['key' => 'comment_upload_img', 'label' => '评论图片上传', 'type' => 'switch', 'default' => false],
                             ['key' => 'comment_link', 'label' => '链接按钮', 'type' => 'switch', 'default' => false],
                         ]],
                         ['key' => 'interaction', 'title' => '互动功能', 'fields' => [