fix(qr-server): remove deprecated FastMCP constructor args

The Python SDK (modelcontextprotocol/python-sdk#1898) moved
transport-specific parameters (port, stateless_http) from FastMCP
constructor to run(). This broke the qr-server when run via stdio.

The port is already passed directly to uvicorn.run() for HTTP mode,
so these constructor args were redundant.

Author: antonpk1

examples/qr-server/server.py

@@ -27,7 +27,7 @@
 HOST = os.environ.get("HOST", "0.0.0.0")  # 0.0.0.0 for Docker compatibility
 PORT = int(os.environ.get("PORT", "3108"))
 
-mcp = FastMCP("QR Code Server", port=PORT, stateless_http=True)
+mcp = FastMCP("QR Code Server")
 
 
 @mcp.tool(meta={