[Bugfix] fix smg command argument cannot be used multiple times

[lengrongfu]

Summary

Fix: #365

Because generate smg command argument --disable-retries --disable-circuit-breaker this part is multiple times.

/home/jovyan/code/tokenspeed/.venv/bin/python3 -m smg launch --worker-urls grpc://127.0.0.1:37693 --disable-retries --disable-circuit-breaker --model /new-model/gpt-oss-20b/ --log-level debug --port 8000 --reasoning-parser passthrough --disable-circuit-breaker --disable-retries --tokenizer-cache-enable-l0 --tokenizer-cache-enable-l1 --prometheus-port 8413

In _gateway_args_with_smg_disable_defaults this method will add this two default argument.

_DEFAULT_SMG_DISABLE_FLAGS = (
    "--disable-circuit-breaker",
    "--disable-retries",
)
def _gateway_args_with_smg_disable_defaults(gateway_args: list[str]) -> list[str]:
    """Append the smg reliability-disable switches if they are not already there."""
    result = list(gateway_args)
    for flag in _DEFAULT_SMG_DISABLE_FLAGS:
        if flag not in result:
            result.append(flag)
    return result

Test Plan

$ tokenspeed serve /new-model/gpt-oss-20b/ --log-level debug

[chatgpt-codex-connector]

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[lengrongfu]

@lightseek-bot please take a look.