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/PostDisplay.php

@@ -429,7 +429,6 @@ class PostDisplay {
             'editor_mode'          => $editor_mode,
             'draft_save'           => !isset($settings['front_submit_draft_save']) || !empty($settings['front_submit_draft_save']),
             'leave_warning'        => !isset($settings['front_submit_leave_warning']) || !empty($settings['front_submit_leave_warning']),
-            'captcha'              => !empty($settings['front_submit_captcha']) || !empty($settings['verification_newposts_s']),
             'pay_free_s'           => !isset($settings['post_article_pay_free_s']) || !empty($settings['post_article_pay_free_s']),
             'pay_price_min'        => max(0, (float) ($settings['post_article_pay_price_min'] ?? 0)),
             'pay_price_max'        => max(0, (float) ($settings['post_article_pay_price_max'] ?? 100)),