fix(docs): correct README installation command syntax

- Fix pip install command by enclosing extras in double quotes
- Remove extra spaces and normalize casing in extra packages list
- Ensure command works correctly for installing optional dependencies

Author: Phil-Fan

README.zh_CN.md

@@ -84,10 +84,9 @@ pip install trpc-agent-py
 按需安装扩展能力：
 
 ```bash
-pip install trpc-agent-py[a2a,ag-ui,knowledge,agent-claude,mem0, Mempalace, langfuse]
+pip install "trpc-agent-py[a2a,ag-ui,knowledge,agent-claude,mem0,mempalace,langfuse]"
 ```
 
-
 ### 开发天气查询Agent
 
 ```python