chore: MIT 许可证落地——LICENSE 全文、package.json license 字段与 README 边界声明

LICENSE

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

@@ -161,3 +161,9 @@ docker compose ps          # migrate 应为 exited(0)，其余 running/healthy
 4. **1000 条硬上限**：窗口只保留最近 1000 条——当前日志速率下约等于 3 天；同步停摆超过窗口会永久丢数据
 5. **`TokenAuthReadOnly`**：用量/日志接口用宽松鉴权，key 过期 / 额度耗尽仍可查询；**显式禁用会被 401 拒绝**
 6. **`DisplayTokenStatEnabled` 已开启**：billing 接口返回 token 级额度
+
+## License
+
+[MIT](LICENSE) © 2026 skycurtain
+
+NAKU 是 NewAPI 的**独立客户端**，仅通过 HTTP API 交互，不包含其源码；与上游许可证相互独立。上游 NewAPI 为 AGPL-3.0，本项目不受其传染，亦不衍生自它。

package.json

@@ -1,6 +1,7 @@
 {
   "name": "new-api-key-usage",
   "private": true,
+  "license": "MIT",
   "type": "module",
   "workspaces": [
     "apps/*",