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>

autoload/front/controls/class.Site.php

@@ -133,7 +133,9 @@ class Site
     switch ( $a )
     {
       case 'page':
-        $page = \front\factory\Pages::page_details( \Shared\Helpers\Helpers::get( 'id' ) );
+        global $lang_id;
+        $pagesRepo = new \Domain\Pages\PagesRepository( $GLOBALS['mdb'] );
+        $page = $pagesRepo->frontPageDetails( \Shared\Helpers\Helpers::get( 'id' ), $lang_id ?? '' );
         \Shared\Helpers\Helpers::set_session( 'page', $page );
       break;