Reorganized the project into a standard Python package structure with a `src` layout.
Encapsulated the core slide generation logic into a `SlideDeckAI` class in `slidedeckai/core.py`.
Refactored the Streamlit app (`app.py`) to use the new `slidedeckai` package, preserving all UI functionality.
Added a command-line interface (CLI) for generating slide decks.
Included necessary packaging files (`pyproject.toml`, `MANIFEST.in`, `_version.py`).