refactor(admin): consolidate duplicate configuration

Remove duplicate comment, captcha, filing, and website-security configuration paths.

Move front submission verification to the captcha scene matrix and retire obsolete admin routes and components.

src/Settings/DisplayPageGroups.php

@@ -137,7 +137,6 @@ trait DisplayPageGroups {
             'header_newposts'             => self::get_header_newposts_config(),
             'header_theme'                => self::get_header_theme_config(),
             'friend_links'                => self::get_friend_links(),
-            'comment_enabled'             => self::comment_enabled(),
             'cms_features'                => self::get_cms_features(),
             'page_display'                => self::get_page_display_settings(),
             'footer_theme'                => self::get_footer_theme_config(),