refactor: retire filtre courrier et lien Vision, prépare module licence Vision

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

web/includes/layout.php

@@ -1,6 +1,5 @@
 <?php
 
-define('VISION_URL', 'http://192.168.111.212');
 
 function html_head(string $title): void {
     $domain = cfg('domain', 'copymail');
@@ -48,8 +47,6 @@ function html_navbar(string $active = ''): void {
     }
     echo '</ul>';
     echo '<div class="d-flex align-items-center gap-2">';
-    // Lien Vision
-    echo '<a class="btn btn-outline-light btn-sm" href="' . VISION_URL . '" target="_blank" title="Ouvrir Vision"><i class="bi bi-grid-fill me-1"></i>Vision</a>';
     echo "{$roleBadge}<span class=\"navbar-text me-2\"><i class=\"bi bi-person-circle me-1\"></i>{$user}</span>";
     echo '<a class="btn btn-outline-light btn-sm" href="/logout.php"><i class="bi bi-box-arrow-right me-1"></i>Déconnexion</a>';
     echo '</div></div></div></nav>';