docs: add related projects section linking openclaw-a2a-gateway

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

Author: AliceLJY

README.md

@@ -347,6 +347,10 @@ Set in `config.json` at `shared.executor`, or override with `BRIDGE_EXECUTOR`.
 
 ---
 
+## Related Projects
+
+- **[openclaw-a2a-gateway](https://github.com/win4r/openclaw-a2a-gateway)** — Google A2A v0.3.0 protocol plugin for OpenClaw. Server-side agent-to-agent communication across servers. If telegram-ai-bridge is the phone remote control, this is the server backbone.
+
 ## Development
 
 ```bash

README_CN.md

@@ -347,6 +347,10 @@ docker run -d \
 
 ---
 
+## 相关项目
+
+- **[openclaw-a2a-gateway](https://github.com/win4r/openclaw-a2a-gateway)** — OpenClaw 的 Google A2A v0.3.0 协议插件，服务端 agent 跨服务器通信。如果 telegram-ai-bridge 是手机遥控器，这个就是服务端骨干网。
+
 ## 开发
 
 ```bash