Major refactoring (#80)

* Add Dockerfile and docker-compose.yml for containerized deployment

* Refactor build configuration to include only necessary directories and files and update packages

* Add pre-commit configuration for code quality checks and type checking

* Add CI and Docker workflows, implement Docker container health check action, and remove obsolete workflows

* Remove server configuration from JSON settings

* Remove installation script for RPi-AI

* Refactor chatbot server and tests to improve error handling and remove unused code

* Add GEMINI_API_KEY to environment configuration and update Docker workflows