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/Capabilities.php

@@ -153,48 +153,6 @@ class Capabilities {
         return false;
     }
 
-    /**
-     * 获取"网站安全"设置（人机验证见 aksrt_get_captcha_status_summary）。
-     */
-    public static function get_security_settings(): array {
-        $s = Settings::get_all();
-
-        $captcha = function_exists('aksrt_get_captcha_status_summary')
-            ? aksrt_get_captcha_status_summary()
-            : ['enabled' => false, 'provider' => '', 'configured' => false, 'scenes' => []];
-
-        return [
-            'captcha'               => $captcha,
-            'brush_limit_post'      => [
-                'enabled'    => !empty($s['brush_limit_post_enabled']),
-                'minutes_10' => (int) ($s['brush_limit_post_minutes_10'] ?? 20),
-                'day_1'      => (int) ($s['brush_limit_post_day_1'] ?? 50),
-            ],
-            'brush_limit_comment'   => [
-                'enabled'    => !empty($s['brush_limit_comment_enabled']),
-                'minutes_10' => (int) ($s['brush_limit_comment_minutes_10'] ?? 20),
-                'day_1'      => (int) ($s['brush_limit_comment_day_1'] ?? 100),
-            ],
-            'brush_limit_upload'    => [
-                'enabled'    => !empty($s['brush_limit_upload_enabled']),
-                'minutes_10' => (int) ($s['brush_limit_upload_minutes_10'] ?? 50),
-                'day_1'      => (int) ($s['brush_limit_upload_day_1'] ?? 200),
-            ],
-            'brush_limit_register'  => [
-                'enabled'    => !empty($s['brush_limit_register_enabled']),
-                'minutes_10' => (int) ($s['brush_limit_register_minutes_10'] ?? 20),
-                'day_1'      => (int) ($s['brush_limit_register_day_1'] ?? 100),
-            ],
-            'brush_limit_order'     => [
-                'enabled'    => !empty($s['brush_limit_order_enabled']),
-                'minutes_10' => (int) ($s['brush_limit_order_minutes_10'] ?? 30),
-                'day_1'      => (int) ($s['brush_limit_order_day_1'] ?? 100),
-            ],
-            'error_frequency_limit' => !empty($s['error_frequency_limit'] ?? true),
-        ];
-    }
-
-
     /**
      * 获取"系统工具"设置
      */