refactor(module11): restructure MCP client implementation and migrate to chapter 11

m11_mcp_advanced/transports/base.py

@@ -0,0 +1,20 @@
+from typing import Protocol,List,Dict,Any
+
+class MCPTransport(Protocol):
+    """MCP 传输层协议 —— 所有 transport必须实现如下方法"""
+
+    async def connect(self):
+        """建立连接"""
+        ...
+
+    async def list_tools(self):
+        """获取工具列表"""
+        ...
+
+    async def call_tool(self,name:str,args:dict):
+        """调用工具并返回文本结果"""
+        ...
+
+    async def cleanup(self):
+        """清理资源"""
+        ...