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- Delete class.Log (unused), class.Mobile_Detect (outdated UA detection)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/Category/CategoryRepository.php

@@ -325,8 +325,8 @@ class CategoryRepository
     private function refreshCategoryArtifacts(): void
     {
         if (class_exists('\\S')) {
-            \S::htacces();
-            \S::delete_dir('../temp/');
+            \Shared\Helpers\Helpers::htacces();
+            \Shared\Helpers\Helpers::delete_dir('../temp/');
         }
     }
 
@@ -336,7 +336,7 @@ class CategoryRepository
             return $this->toNullableString($value);
         }
 
-        $seo = \S::seo((string)$value);
+        $seo = \Shared\Helpers\Helpers::seo((string)$value);
         $seo = trim((string)$seo);
 
         return $seo !== '' ? $seo : null;