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- Delete class.Log (unused), class.Mobile_Detect (outdated UA detection)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

admin/ajax/shop-category.php

@@ -1,5 +1,5 @@
 <?php
-$a = \S::get( 'a' );
+$a = \Shared\Helpers\Helpers::get( 'a' );
 
 if ( $a == 'save_products_order' )
 {
@@ -7,7 +7,7 @@ if ( $a == 'save_products_order' )
 
   $categoryRepository = new \Domain\Category\CategoryRepository( $mdb );
 
-  if ( $categoryRepository->saveProductOrder( \S::get( 'category_id' ), \S::get( 'products' ) ) )
+  if ( $categoryRepository->saveProductOrder( \Shared\Helpers\Helpers::get( 'category_id' ), \Shared\Helpers\Helpers::get( 'products' ) ) )
     $response = [ 'status' => 'ok' ];
   
   echo json_encode( $response );

admin/ajax/users.php

@@ -1,11 +1,11 @@
 <?php
-$a = \S::get( 'a' );
+$a = \Shared\Helpers\Helpers::get( 'a' );
 
 if ( $a == 'check_login' )
 {
   global $mdb;
   $repository = new \Domain\User\UserRepository( $mdb );
-  $response = $repository->checkLogin( (string)\S::get( 'login' ), (int)\S::get( 'user_id' ) );
+  $response = $repository->checkLogin( (string)\Shared\Helpers\Helpers::get( 'login' ), (int)\Shared\Helpers\Helpers::get( 'user_id' ) );
   echo json_encode( $response );
   exit;
 }