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- Delete class.Log (unused), class.Mobile_Detect (outdated UA detection)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/User/UserRepository.php

@@ -101,7 +101,7 @@ class UserRepository
         $subject = 'Twoj kod logowania 2FA';
         $body = 'Twoj kod logowania do panelu administratora: ' . $code . '. Kod jest wazny przez 10 minut.';
 
-        $sent = \S::send_email($to, $subject, $body);
+        $sent = \Shared\Helpers\Helpers::send_email($to, $subject, $body);
         if ($sent) {
             return true;
         }
@@ -154,7 +154,7 @@ class UserRepository
             ]);
 
             if ($inserted) {
-                \S::delete_dir('../temp/');
+                \Shared\Helpers\Helpers::delete_dir('../temp/');
                 return ['status' => 'ok', 'msg' => 'Uzytkownik zostal zapisany.'];
             }
 
@@ -187,7 +187,7 @@ class UserRepository
             'id' => $userId,
         ]);
 
-        \S::delete_dir('../temp/');
+        \Shared\Helpers\Helpers::delete_dir('../temp/');
         return ['status' => 'ok', 'msg' => 'Uzytkownik zostal zapisany.'];
     }