Refactor StreamingAudioWriter to improve audio encoding reliability
- Restructure audio encoding logic for better error handling
- Create a new method `_create_container()` to manage container creation
- Improve handling of different audio formats and encoding scenarios
- Add error logging for audio chunk encoding failures
- Simplify container and stream management in write_chunk method
- Implement OpenAI-compatible API key authentication
- Add configuration options for GPU instances, concurrency, and request handling
- Update README with authentication instructions
- Modify configuration and routing to support optional API key verification
- Enhance system information and debug endpoints to expose authentication status
