ver. 0.286: Layouts, Menu, Pages frontend migration to Domain

- Add 6 frontend methods to LayoutsRepository (Redis cache, 3-level fallback)
- Add 6 frontend methods to PagesRepository (Redis cache, recursive pages)
- Create front\Views\Menu (clean VIEW replacing front\view\Menu)
- Delete front\factory\Layouts, Menu, Pages + front\view\Menu + dead submenu.php
- Fix null $lang_id TypeError in check_url_params() (remove string type hint + ?? '')
- Optimize Helpers::htacces() from 3 layout calls to 1
- Tests: 470 OK, 1484 assertions (+16 new)

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

templates/menu/pages.php

@@ -47,7 +47,7 @@ if ( is_array( $this -> pages ) ) {
     echo '</a>';
     if ( is_array( $page['pages'] ) )
       echo '<i class="fa fa-chevron-down menu-toggle" menu-id="link-' . $page['id'] . '"></i>';
-    echo \front\view\Menu::pages( $page['pages'], $this -> level + 1, $this -> current_page );
+    echo \front\Views\Menu::pages( $page['pages'], $this -> level + 1, $this -> current_page );
     echo '</li>';
   }
   echo '</ul>';