ver. 0.283: Legacy class cleanup — S, Html, Email, Image, Log, Mobile_Detect → Shared namespace

- Migrate class.S → Shared\Helpers\Helpers (140+ files), remove 12 unused methods
- Migrate class.Html → Shared\Html\Html
- Migrate class.Email → Shared\Email\Email
- Migrate class.Image → Shared\Image\ImageManipulator
- Delete class.Log (unused), class.Mobile_Detect (outdated UA detection)
- Remove grid library loading from admin (index.php, ajax.php)
- Replace gridEdit usage in 10 admin templates with grid-edit-replacement.php
- Fix grid-edit-replacement.php AJAX to send values as JSON (grid.js compat)
- Remove mobile layout conditionals (m_html/m_css/m_js) from Site + LayoutsRepository
- Remove \Log::save_log() calls from OrderAdminService, ShopOrder, Order

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

autoload/front/factory/class.Pages.php

@@ -30,7 +30,7 @@ class Pages
   {
     $page = self::page_details( $page_id, $lang_id );
 
-    $page['language']['seo_link'] ? $url = '/' . $page['language']['seo_link'] : $url = '/s-' . $page['id'] . '-' . \S::seo( $page['language']['title'] );
+    $page['language']['seo_link'] ? $url = '/' . $page['language']['seo_link'] : $url = '/s-' . $page['id'] . '-' . \Shared\Helpers\Helpers::seo( $page['language']['title'] );
 
     if ( $lang_id != ( new \Domain\Languages\LanguagesRepository( $GLOBALS['mdb'] ) )->defaultLanguage() and $url != '#' )
       $url = '/' . $lang_id . $url;