docs: fix license section in READMEs to match BSL 1.1

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

Author: gcmsg

README.md

@@ -466,4 +466,6 @@ Agents registered on different servers can discover and signal each other throug
 
 ## License
 
-MIT
+Business Source License 1.1 (BUSL-1.1) — see [LICENSE](LICENSE) for details.
+
+Source-available and free for self-hosting. The only restriction is offering it as a competing hosted service. Converts to Apache 2.0 on 2029-03-12.

README_zh.md

@@ -466,4 +466,6 @@ federation:
 
 ## 许可证
 
-MIT
+Business Source License 1.1 (BUSL-1.1) — 详见 [LICENSE](LICENSE)。
+
+代码完全公开，可自由查看和自部署。唯一限制是不能用于提供竞品托管服务。2029-03-12 自动转为 Apache 2.0。