Fix API response compatibility issues (v0.1.1)
- Make id, object, created fields optional in ChatCompletion
- Make id, object, created, model fields optional in ChatCompletionChunk
- Make Usage fields optional to handle empty usage objects in streaming
- Fix streaming by using httpx send() with stream=True instead of stream context manager
Tested with real API calls:
- Chat completions: working
- Streaming: working
- Embeddings: working
- Tool calling: working