feat: 添加接口文档链接至指南，更新配置以支持多语言API参考

docs/en/guide/api.md

@@ -0,0 +1,4 @@
+# API Reference
+
+Official: [https://docs.lm.cedar-v.com/api/](https://docs.lm.cedar-v.com/api/)
+Local deployment: [http://localhost:18888/swagger/index.html](http://localhost:18888/swagger/index.html)