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- Delete class.Log (unused), class.Mobile_Detect (outdated UA detection)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/templates/site/main-layout.php

@@ -41,8 +41,8 @@
       <div class="menu">
         <div class="logo sticky-top">
           shop<b>Pro</b>
-          <span>ver. <?= \S::get_version();?></span><br>
-          <? if ( $settings[ 'update' ] and \S::get_new_version() > \S::get_version() ):?>
+          <span>ver. <?= \Shared\Helpers\Helpers::get_version();?></span><br>
+          <? if ( $settings[ 'update' ] and \Shared\Helpers\Helpers::get_new_version() > \Shared\Helpers\Helpers::get_version() ):?>
             <a href="/admin/update/main_view/" class="label label-danger">aktualizacja</a>
           <? endif;?>
         </div>
@@ -187,8 +187,8 @@
             </div>
           </div>
           <?
-          if ( $alert = \S::get_session( 'alert' ) ):
-            \S::alert( false );
+          if ( $alert = \Shared\Helpers\Helpers::get_session( 'alert' ) ):
+            \Shared\Helpers\Helpers::alert( false );
             ?>
             <div class="row">
               <div class=" col-12">