fix: env parameters exception when configuring SSE or HTTP MCP server (#513)

* fix: _create_streamable_http_session() got an unexpected keyword argument 'env'

fix unit error

* update md

---------

Co-authored-by: Willem Jiang <willem.jiang@gmail.com>

tests/unit/server/test_mcp_utils.py

@@ -87,10 +87,15 @@ async def test_load_mcp_tools_sse_success(mock_sse_client, mock_get_tools):
     result = await mcp_utils.load_mcp_tools(
         server_type="sse",
         url="http://localhost:1234",
+        headers={"Authorization": "Bearer 1234567890"},
         timeout_seconds=7,
     )
     assert result == ["toolB"]
-    mock_sse_client.assert_called_once_with(url="http://localhost:1234")
+    mock_sse_client.assert_called_once_with(
+        url="http://localhost:1234",
+        headers={"Authorization": "Bearer 1234567890"},
+        timeout=7,
+    )
     mock_get_tools.assert_awaited_once_with(mock_client, 7)