fix: correct FastMCP interface usage and resolve lint issues

- Fix FastMCP server interface to use correct mcp.run() instead of app.run(host, port)
- Remove unnecessary host and port parameters, use standard STDIO transport
- Fix all ruff lint issues including import sorting and blank lines
- Update ruff configuration to new lint configuration format
- Fix type annotation issues using Union syntax (int | None)
- Ensure uvx pypi-query-mcp-server works correctly
- All tests pass and lint checks pass

noxfile.py

@@ -5,18 +5,14 @@ import sys
 # Import third-party modules
 import nox
 
-
 ROOT = os.path.dirname(__file__)
 
 # Ensure pypi_query_mcp is importable.
 if ROOT not in sys.path:
     sys.path.append(ROOT)
 
-# Import third-party modules
-from nox_actions import codetest  # noqa: E402
-from nox_actions import lint  # noqa: E402
-from nox_actions import release  # noqa: E402
-
+# Import local modules (after sys.path setup)
+from nox_actions import codetest, lint, release  # noqa: E402
 
 # Configure nox sessions
 nox.session(lint.lint, name="lint")