fix: enhance OpenAI stream handling and error management
- Updated the `openAIChunkToTextDelta` function to include error handling with a try-catch block, improving robustness during stream processing.
- Refined the `readableStreamAsyncIterable` function to ensure proper handling of stream completion and errors, including a return method for cleanup.
- Adjusted type definitions for better clarity and consistency in the handling of async iterables.
SuYao
bc5cc4bf02