fix: support cache-write usage across OpenAI Python versions#3773
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This pull request resolves #3772 by supporting the
cache_write_tokensusage field across OpenAI Python 2.44 and 2.45.It constructs input-token details through a version-compatible validation path and preserves cache-write counts across provider conversion, aggregation, tracing, and RunState serialization. RunState schema 1.12 prevents older readers from silently losing the new usage data while retaining backward compatibility with existing snapshots. The supported OpenAI dependency range remains unchanged.