fix: Stateless auth handler.

[aidanCQ]

Client reads from single source of truth (disk) to avoid sync or staleness issues.

[aidanCQ]

@respx.mock
def test_latency() -> None:
    fake_date = "foo"
    path = "/api/projects/v1beta"
    respx.get(f"{get_nexus_client().base_url}{path}").mock(
        return_value=httpx.Response(
            status_code=200,
            json={"data": {}},
            headers={"Sunset": fake_date},
        )
    )
    start = time.time()
    for n in range(20):
        with warnings.catch_warnings(record=True) as captured:
            qnx.projects.get_all().list()
            print(n)

    end = time.time()
    length = end - start

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