Fkwp/add license header (#94)

* changed license header

* add commerical license file

main.go

@@ -1,29 +1,20 @@
 // Copyright 2023 New Vector Ltd
-
-// 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.
-
-// This program is distributed in the hope that it will be useful,
-// but WITHOUT ANY WARRANTY; without even the implied warranty of
-// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-// GNU Affero General Public License for more details.
-
-// You should have received a copy of the GNU Affero General Public License
-// along with this program.  If not, see <http://www.gnu.org/licenses/>.
+// Copyright 2025 New Vector Ltd
+//
+// SPDX-License-Identifier: AGPL-3.0-only OR LicenseRef-Element-Commercial
+// Please see LICENSE files in the repository root for full details.
 
 package main
 
 import (
 	"context"
+	"crypto/tls"
 	"encoding/json"
 	"errors"
 	"fmt"
 	"log"
 	"net/http"
 	"os"
-	"crypto/tls"
 	"strings"
 
 	"time"