Add copyright to TLV files

- Add copyright to kmesh_tlv.proto and send_tlv.rs

Signed-off-by: Eeshu-Yadav <eeshuyadav123@gmail.com>

Author: Eeshu-Yadav

examples/tlv-filter-demo/send_tlv.rs

@@ -1,3 +1,23 @@
+// SPDX-FileCopyrightText: © 2025 kmesh authors
+// SPDX-License-Identifier: Apache-2.0
+//
+// Copyright 2025 kmesh authors
+//
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//   http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+//
+//
+
 use std::env;
 use std::io::Write;
 use std::net::{TcpStream, IpAddr};

proto/extensions/filters/listener/kmesh_tlv/v3/kmesh_tlv.proto

@@ -1,3 +1,23 @@
+// SPDX-FileCopyrightText: © 2025 kmesh authors
+// SPDX-License-Identifier: Apache-2.0
+//
+// Copyright 2025 kmesh authors
+//
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//   http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+//
+//
+
 syntax = "proto3";
 
 package envoy.extensions.filters.listener.kmesh_tlv.v3;