docs: document api-keys usage in README and README_CN

- Added explanation and examples for `api-keys` configuration.
- Updated both English and Chinese documentation.

README.md

@@ -357,6 +357,11 @@ remote-management:
 # Authentication directory (supports ~ for home directory). If you use Windows, please set the directory like this: `C:/cli-proxy-api/`
 auth-dir: "~/.cli-proxy-api"
 
+# API keys for authentication
+api-keys:
+  - "your-api-key-1"
+  - "your-api-key-2"
+
 # Enable debug logging
 debug: false
 

README_CN.md

@@ -368,6 +368,11 @@ remote-management:
 # 身份验证目录（支持 ~ 表示主目录）。如果你使用Windows，建议设置成`C:/cli-proxy-api/`。
 auth-dir: "~/.cli-proxy-api"
 
+# 请求认证使用的API密钥
+api-keys:
+  - "your-api-key-1"
+  - "your-api-key-2"
+
 # 启用调试日志
 debug: false