chore: 许可证由 GPL-2.0 修正为 AGPL-3.0-only 并补全第三方归属声明

protos/NOTICE

@@ -0,0 +1,24 @@
+Third-Party Code Attribution
+=============================
+
+The files in this directory (message.proto and rendezvous.proto) are derived
+from the protocol definition files of the RustDesk project
+(https://github.com/rustdesk/rustdesk), including the use of the original
+`package hbb;` namespace.
+
+Upstream work:
+  RustDesk - https://github.com/rustdesk/rustdesk
+  Copyright (C) the RustDesk contributors
+  Licensed under the GNU Affero General Public License v3.0 (AGPL-3.0-only)
+
+Modifications:
+  The files have been adapted and modified for use in One-KVM. They are
+  redistributed under the same license (AGPL-3.0-only), in accordance with
+  sections 4 and 5 of that license.
+
+The complete text of the GNU Affero General Public License v3.0 is available
+in the LICENSE file at the root of this repository and at:
+https://www.gnu.org/licenses/agpl-3.0.en.html
+
+The corresponding source code of One-KVM, including these files, is available
+at https://github.com/mofeng-git/One-KVM (see the release tags).