* build: replace openai package with @cherrystudio/openai
Update all imports from 'openai' to '@cherrystudio/openai' and remove the yarn patch
* refactor(OpenAIResponseAPIClient): simplify token estimation logic for function call output
Consolidate token estimation by first concatenating all output parts into a single string before counting tokens. This improves maintainability and handles additional output types consistently.
Phantom
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