feat: Profil + Deconnexion dans le menu header (⚙️)

- Profil: ouvre Config → scroll vers section Profil (langue, nom)
- Deconnexion: logout via /api/auth/logout, visible si auth activee
- Redemarrage: window.location.reload apres logout

frontend/js/config.js

@@ -617,6 +617,33 @@ function initConfigModal() {
   // Load existing keys on modal open
   document.getElementById("config-open-btn").addEventListener("click", loadAIKeys);
 
+  // Profile menu button: open config modal and scroll to profile section
+  var profileBtn = document.getElementById("profile-open-btn");
+  if (profileBtn) {
+    profileBtn.addEventListener("click", function() {
+      openConfigModal();
+      setTimeout(function() {
+        var el = document.getElementById("cfg-profile");
+        if (el) el.scrollIntoView({ behavior: 'smooth' });
+      }, 300);
+    });
+  }
+
+  // Logout button
+  var logoutBtn = document.getElementById("logout-btn");
+  if (logoutBtn && AuthManager && AuthManager._authEnabled) {
+    // Show if user is logged in
+    var user = AuthManager.getCurrentUser();
+    if (user) logoutBtn.style.display = '';
+    logoutBtn.addEventListener("click", function() {
+      if (confirm("Voulez-vous vraiment vous deconnecter ?")) {
+        fetch("/api/auth/logout", { method: "POST" })
+          .then(function() { window.location.reload(); })
+          .catch(function() { window.location.reload(); });
+      }
+    });
+  }
+
   // Config nav search
   var cfgSearch = document.getElementById("config-nav-search");
   if (cfgSearch) {