ver. 0.280: Articles frontend migration, class.Article removal, Settings facade cleanup

- Add 8 frontend methods to ArticleRepository (with Redis cache)
- Create front\Views\Articles (rendering + utility methods)
- Rewire front\view\Site::show() and front\controls\Site::route() to repo + Views
- Update 5 article templates to use \front\Views\Articles::
- Convert front\factory\Articles and front\view\Articles to facades
- Remove class.Article (entity + static methods migrated to repo + Views)
- Remove front\factory\Settings facade (already migrated)
- Fix: eliminate global $lang from articleNoindex(), inline page sort query
- Tests: 450 OK, 1431 assertions (+13 new)

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

templates/articles/article.php

@@ -1,7 +1,7 @@
 <? global $lang;?>
 <?
 $text = $this -> article['language']['text'];
-$text = \front\factory\Articles::generateHeadersIds( $text );
+$text = \front\Views\Articles::generateHeadersIds( $text );
 ?>
 <div class="article">
   <?
@@ -32,7 +32,7 @@ $text = \front\factory\Articles::generateHeadersIds( $text );
         <div class="title">
           <?= \S::lang( 'spis-tresci' );?>
         </div>
-        <?= \front\factory\Articles::generateTableOfContents( $text );?>
+        <?= \front\Views\Articles::generateTableOfContents( $text );?>
       </div>
     <? endif;?>
   <? endif;?>