pyproject: Add venv to pyproject

pyright and Zed use the venv setting in pyright to correctly determine
the virtual env to use.

Author: dsp-ant

pyproject.toml

@@ -23,6 +23,8 @@ packages = ["mcp_python"]
 [tool.pyright]
 include = ["mcp_python", "tests"]
 typeCheckingMode = "strict"
+venvPath = "."
+venv = ".venv"
 
 [tool.ruff]
 select = ["E", "F", "I"]