Add examples/async_usage.py with:
- Simple async chat completion
- Async streaming with aiter_lines()
- Chat with context using chatId
- Get chat histories asynchronously
- Get app analytics
- Multiple concurrent requests with asyncio.gather()
- Chat with template variables
- Get chat records
🤖 Generated with [Claude Code](https://claude.com/claude-code)
Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>
- Add 111 unit tests covering all client classes and exceptions
- Test BaseClientMixin: initialization, validation, retry logic
- Test FastGPTClient: HTTP requests, streaming, error handling, context manager
- Test ChatClient: all chat operations (completion, histories, records, feedback)
- Test AppClient: app analytics and logs
- Test all exception classes with various configurations
- Add shared pytest fixtures in conftest.py
🤖 Generated with [Claude Code](https://claude.com/claude-code)
Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>
