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- Delete class.Log (unused), class.Mobile_Detect (outdated UA detection)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/Layouts/LayoutsRepository.php

@@ -20,7 +20,7 @@ class LayoutsRepository
 
         $deleted = (bool)$this->db->delete('pp_layouts', ['id' => $layoutId]);
         if ($deleted) {
-            \S::delete_dir('../temp/');
+            \Shared\Helpers\Helpers::delete_dir('../temp/');
             $this->clearFrontLayoutsCache();
         }
 
@@ -51,9 +51,6 @@ class LayoutsRepository
             'html' => (string)($data['html'] ?? ''),
             'css' => (string)($data['css'] ?? ''),
             'js' => (string)($data['js'] ?? ''),
-            'm_html' => (string)($data['m_html'] ?? ''),
-            'm_css' => (string)($data['m_css'] ?? ''),
-            'm_js' => (string)($data['m_js'] ?? ''),
             'status' => $status,
             'categories_default' => $categoriesDefault,
         ];
@@ -82,7 +79,7 @@ class LayoutsRepository
         $this->db->delete('pp_layouts_categories', ['layout_id' => $layoutId]);
         $this->syncCategories($layoutId, $data['categories'] ?? []);
 
-        \S::delete_dir('../temp/');
+        \Shared\Helpers\Helpers::delete_dir('../temp/');
         $this->clearFrontLayoutsCache();
 
         return $layoutId;
@@ -287,9 +284,6 @@ class LayoutsRepository
             'html' => '',
             'css' => '',
             'js' => '',
-            'm_html' => '',
-            'm_css' => '',
-            'm_js' => '',
             'pages' => [],
             'categories' => [],
         ];