Refactor code structure for improved readability and maintainability

Remove latency measurement and related metadata from ask function; update example question for clarity

Refactor Langfuse integration in ask function and update client configuration for improved error handling

Implement Langfuse tracing in ask function and update dependencies for improved observability

Update .gitignore to include __pycache__ and refactor main.py to implement OpenRouterOpenAI class and configure models function; add ask.py for query execution