fix: logout supprime access_token cookie + bouton toujours visible

- Backend: delete_cookie access_token (/) + refresh_token
- Logout ne requiert plus auth (graceful si token expire)
- Bouton Deconnexion toujours visible dans le menu

backend/auth/router.py

@@ -217,18 +217,21 @@ async def refresh_token_endpoint(request: Request, response: Response):
 async def logout(
     request: Request,
     response: Response,
-    current_user=Depends(require_auth),
 ):
-    """Logout: revoke refresh token and delete cookie."""
+    """Logout: revoke refresh token and delete cookies."""
     refresh_tok = request.cookies.get("refresh_token")
     if refresh_tok:
         payload = decode_token(refresh_tok)
         if payload:
-            revoke_token(payload["jti"])
+            try:
+                revoke_token(payload["jti"])
+            except Exception:
+                pass  # token already revoked
 
     response.delete_cookie("refresh_token", path="/api/auth/refresh")
-    logger.info(f"User '{current_user['username']}' logged out")
-    return {"message": "Déconnecté avec succès"}
+    response.delete_cookie("access_token", path="/")
+    response.delete_cookie("access_token", path="/api")  # just in case
+    return {"message": "Deconnecte avec succes"}
 
 
 @router.get("/me")

frontend/index.html

@@ -662,7 +662,6 @@
                                     id="logout-btn"
                                     type="button"
                                     role="menuitem"
-                                    style="display:none"
                                 >
                                     <span
                                         class="menu-list-icon"

frontend/js/config.js

@@ -630,12 +630,9 @@ function initConfigModal() {
     });
   }
 
-  // Logout button
+  // Logout button (always visible)
   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 = '';
+  if (logoutBtn) {
     logoutBtn.addEventListener("click", function() {
       if (confirm("Voulez-vous vraiment vous deconnecter ?")) {
         fetch("/api/auth/logout", { method: "POST" })