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/DomainGroups.php

@@ -158,13 +158,6 @@ trait DomainGroups {
         return Capabilities::user_can($cap, $user_id, $context);
     }
 
-    /**
-     * 获取"网站安全"设置
-     */
-    public static function get_security_settings(): array {
-        return Capabilities::get_security_settings();
-    }
-
     /**
      * 获取"系统工具"设置
      */