Restructure README: intro, examples (with screenshots), setup, docs

Add example screenshots inline to README

Add 2 example screenshots for documentation

Add finalized documentation.md

Drop gradio pin from requirements (HF resolves from README)

Bump gradio sdk_version to 5.49.1 for Python 3.13 compatibility

Fix Python 3.13 audioop compatibility (pin gradio + add audioop-lts)

Initial deployment: apartment predictor chat

initial commit