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- Delete class.Log (unused), class.Mobile_Detect (outdated UA detection)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

templates/articles/article-entry.php

@@ -1,12 +1,12 @@
 <? global $lang;?>
 <div class="col-12 col-md-6 ">
   <div class="article-entry">
-    <? $this -> article['language']['seo_link'] ? $url = $this -> article['language']['seo_link'] : $url = 'a-' . $this -> article['id'] . '-' . \S::seo( $this -> article['language']['title'] );?>
+    <? $this -> article['language']['seo_link'] ? $url = $this -> article['language']['seo_link'] : $url = 'a-' . $this -> article['id'] . '-' . \Shared\Helpers\Helpers::seo( $this -> article['language']['title'] );?>
     <div class="blog-image">
         <a href="/<?= $url;?>"  title="<?= $this -> article['language']['title'];?>" <? if ( $this -> article['language']['noindex'] ):?>rel="nofollow"<? endif;?>>  <img src="<?= \front\Views\Articles::getImage( $this -> article );?>" alt="<?= $this -> article['language']['title'];?>"></a>
     </div>
     <h3 class="article-title">
-      <a href="/<? if ( \S::get_session( 'current-lang' ) != ( new \Domain\Languages\LanguagesRepository( $GLOBALS['mdb'] ) )->defaultLanguage() ) echo \S::get_session( 'current-lang' ) . '/';?><?= $url;?>" title="<?= $this -> article['language']['title'];?>"  <? if ( $this -> article['language']['noindex'] ):?>rel="nofollow"<? endif;?>><?= $this -> article['language']['title'];?></a>
+      <a href="/<? if ( \Shared\Helpers\Helpers::get_session( 'current-lang' ) != ( new \Domain\Languages\LanguagesRepository( $GLOBALS['mdb'] ) )->defaultLanguage() ) echo \Shared\Helpers\Helpers::get_session( 'current-lang' ) . '/';?><?= $url;?>" title="<?= $this -> article['language']['title'];?>"  <? if ( $this -> article['language']['noindex'] ):?>rel="nofollow"<? endif;?>><?= $this -> article['language']['title'];?></a>
     </h3>
     <div class="date-add"><?= date( 'd.m.Y', strtotime( $this -> article['date_add'] ) );?></div>
     <div class="entry">