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/menu.php

@@ -1,5 +1,5 @@
 <div id="menu-container-<?= $this -> menu['id'];?>" class="menu-container-<?= $this -> menu['id'];?>">
   <nav>
-    <?= \front\view\Menu::pages( $this -> menu['pages'], 0, $this -> current_page );?>
+    <?= \front\Views\Menu::pages( $this -> menu['pages'], 0, $this -> current_page );?>
   </nav>
 </div>