feat: add interactive CLI menu with dynamic model listing

- Implement interactive command-line menu with numbered options (1-4)
- Add Change API Key functionality with input validation
- Add Test Connection to verify Gemini API connectivity
- Add Change Model with dynamic model fetching from Gemini API
- Display comprehensive model info: name, context limits, thinking support, capabilities
- Show image attachment support indicator for each model
- Clean table-based UI with proper alignment and formatting
- Replace hardcoded models with real-time API data from Google Gemini
- Add support for changing model at runtime without restart

refactor: project/app name

- fix error ```dpkg-deb: error: package name has characters that aren't lowercase alphanums or '-+.'``` when building the app