refactor: split config.php into modules and lazy-load categories

includes/sidebar.php

@@ -1,18 +1,10 @@
 <!-- Sidebar de navigation -->
+<?php require_once __DIR__ . '/nav-context.php'; ?>
 <nav class="sidebar" role="navigation" aria-label="Navigation principale">
     <a href="/" class="logo" aria-label="Retour à l'accueil">
         <img src="img/logo.png" alt="Logo <?php echo SITE_NAME; ?>">
     </a>
 
-    <?php
-    // Détecter la page courante et ses paramètres
-    $currentPage = basename($_SERVER['PHP_SELF']);
-    $currentCategoryId = isset($_GET['id']) ? intval($_GET['id']) : null;
-    $currentQuery = isset($_GET['q']) ? trim($_GET['q']) : '';
-    $isTagSearch = !empty($currentQuery) && substr($currentQuery, 0, 1) === '#';
-    $currentTag = $isTagSearch ? substr($currentQuery, 1) : '';
-    ?>
-
     <div class="sidebar-nav">
         <a href="/" class="nav-item <?php echo ($currentPage === 'index.php') ? 'active' : ''; ?>" data-title="Accueil" aria-current="<?php echo ($currentPage === 'index.php') ? 'page' : 'false'; ?>">
             <i class="fas fa-home" aria-hidden="true"></i> <span>Accueil</span>