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- Delete class.Log (unused), class.Mobile_Detect (outdated UA detection)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.ShopTransport.php

@@ -41,7 +41,7 @@ class ShopTransport
     }
 
 
-    if ( \S::normalize_decimal( \front\factory\ShopBasket::summary_price( $basket, $coupon ) ) >= \S::normalize_decimal( $settings['free_delivery'] ) )
+    if ( \Shared\Helpers\Helpers::normalize_decimal( \front\factory\ShopBasket::summary_price( $basket, $coupon ) ) >= \Shared\Helpers\Helpers::normalize_decimal( $settings['free_delivery'] ) )
     {
       for ( $i = 0; $i < count( $transports ); $i++ ){
         if($transports[ $i ]['delivery_free'] == 1) {