docs(release): 添加 MIT 许可证与主界面截图

LICENSE

@@ -0,0 +1,21 @@
+MIT License
+
+Copyright (c) 2026 JOJO6618
+
+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

@@ -4,6 +4,8 @@
 
 > 命名：`Astr-`（星）+ `-ion`（粒子）。Agent 像星际间传递信号的粒子，把人类意图传递到工具、文件、终端与子智能体之间。
 
+![Astrion 主界面](screenshots/main-ui.png)
+
 ---
 
 ## ⚠️ 重要声明
@@ -257,8 +259,7 @@ npm --prefix cli run typecheck && npm --prefix cli run build # CLI
 
 ## 许可证
 
-<!-- TODO: 选择许可证后替换（MIT / Apache-2.0 / …），并添加 LICENSE 文件 -->
-待定（发布前补充）。
+[MIT](LICENSE)
 
 ---