- Add `AppConfig` and `PresetConfig` models using Pydantic for config validation
- Refactor `read_configurations` to return an `AppConfig` instance
- Implement `OllamaClient` for chat-based server interaction
- Implement `WhisperClient` for transcription via Whisper CLI
- Migrate notification utilities to `libs` directory
- Update tray application to use new clients and config structure
- Simplify Whisper and Ollama integration logic in `WhisperWorker`
Signed-off-by: Max P. <Mail@MPassarello.de>
