License under AGPL-3.0-or-later: LICENSE, README section, SPDX headers in all JS/PHP/HTML

Co-Authored-By: Claude Fable 5.1 <noreply@anthropic.com>

auth/lib/shell.php

@@ -1,4 +1,14 @@
 <?php
+/*
+ * SvxPortal — web front-end for SvxReflector
+ * Copyright (C) 2026 SA7AUX (Björn)
+ * SPDX-License-Identifier: AGPL-3.0-or-later
+ *
+ * This program is free software: you can redistribute it and/or modify it under
+ * the terms of the GNU Affero General Public License as published by the Free
+ * Software Foundation, either version 3 of the License, or (at your option) any
+ * later version. See the LICENSE file for details.
+ */
 declare(strict_types=1);
 // shell.php — shared PHP helper for every web (dmr-web, svx-web, svxlink-web).
 // Canonical copy: callmgr2/www-mumien/auth/lib/shell.php; other repos carry a COPY.