docs: 补 MIT LICENSE 与许可声明（G-Star 申报要求明确的许可证）

LICENSE

@@ -0,0 +1,21 @@
+MIT License
+
+Copyright (c) 2026 HeNanMU-EEA
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.

README.md

@@ -132,3 +132,7 @@ go test -tags luajit ./internal/lua # 单包（LuaJIT 相关改动必跑）
 - 分支与发布纪律见 [docs/git-workflow.md](docs/git-workflow.md)。
 - 插件放置在 `plugin_dir`，网关启动时**不会**创建、覆盖或删除任何插件文件；
   升级桌面端也不会动它们。
+
+## 许可
+
+MIT License，见 [LICENSE](./LICENSE)。

README_EN.md

@@ -149,3 +149,7 @@ go test -tags luajit ./internal/lua  # one package (required for LuaJIT changes)
 - Branch and release discipline: [docs/git-workflow-en.md](docs/git-workflow-en.md).
 - Plugins live in `plugin_dir`. The gateway never creates, overwrites or deletes
   plugin files, and a desktop upgrade never touches them either.
+
+## License
+
+MIT License, see [LICENSE](./LICENSE).