Fix routing through relay, default network RPS, --token, logging, readme

[borzunov]

• Hide GeneratorExit in _iterate_inference_steps()
• Update README.md about --public_name
• Use .from_pretrained(..., use_auth_token=token) instead of token=token
  until it's fully supported across HF libs
• Use default network speed 25 Mbit/s
• Apply relay penalty in max-throughput routing
• Replace RPS with "tokens/sec per block" in logs
• Increase default expiration