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- Delete class.Log (unused), class.Mobile_Detect (outdated UA detection)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/Domain/Integrations/IntegrationsRepository.php

@@ -51,7 +51,7 @@ class IntegrationsRepository
         } else {
             $this->db->insert( $table, [ 'name' => $name, 'value' => $value ] );
         }
-        \S::delete_dir('../temp/');
+        \Shared\Helpers\Helpers::delete_dir('../temp/');
         return true;
     }
 
@@ -61,7 +61,7 @@ class IntegrationsRepository
     {
         return (bool) $this->db->update( 'pp_shop_products', [
             'apilo_product_id'   => $externalId,
-            'apilo_product_name' => \S::remove_special_chars( $externalName ),
+            'apilo_product_name' => \Shared\Helpers\Helpers::remove_special_chars( $externalName ),
         ], [ 'id' => $productId ] );
     }