Refactor app.py to transition from Flask to FastAPI, enhancing the API with WebSocket support for real-time notifications, improved session handling, and background processing for unanswered questions. Update Dockerfile for compatibility with FastAPI and streamline application setup. Revise README.md to reflect new features and API endpoints.

Improve MongoDB connection handling in app.py by cleaning up the URI format, enhancing logging for connection attempts, and adding debug information for environment variables, while maintaining security by excluding sensitive data.

Enhance MongoDB URI validation in app.py by adding detailed error messages for missing or incorrectly formatted URIs, improving error handling and user guidance.

Enhance logging and debugging capabilities in app.py; add new debug routes and improve health check response. Update .gitignore to include new test files and modify Dockerfile to create log directory with appropriate permissions.

Refactor JSON handling in app.py to use bson.json_util for serialization and update Dockerfile to fix import path for json_util

fixing

Implement initial project structure and setup