test(cost-map): allow ultrafast pricing fields

[Oxygenesis]

Summary\n\nThe merged GPT-6 Astra ultrafast pricing entry adds eight valid cost-map fields, but tests/unit/test_utils.py::test_aaamodel_prices_and_context_window_json_is_valid still rejects them because its intended schema does not list them.\n\nThis PR adds the corresponding numeric schema properties for:\n- cache creation/read ultrafast pricing\n- standard and above-272k ultrafast input pricing\n- standard and above-272k ultrafast output pricing\n\nThis is intentionally separate from behavior changes and from the cache/OpenAPI PRs that exposed the shared misc failure.\n\n## Verification\n\n- python -m py_compile tests/unit/test_utils.py\n- git diff --check\n- isolated JSON Schema validation of the repository cost map passed\n- full CI target test requested by this draft PR

[codecov]

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[Oxygenesis]

The ultrafast pricing fields are now covered by the latest main update in #43764, so this change is redundant and I’m closing it as superseded