feat: add api_headers parameter and callable api_key support#307

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feat/api-headers-190

Commits on May 12, 2026

feat: add `api_headers` parameter and callable `api_key` support (#190)
cpsievert
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fix: wrap sync callable api_key for AsyncOpenAI and clarify api_headers scope
cpsievert
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fix: reject callable api_key in ChatPortkey and add async callable test
cpsievert
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