Extension: auto-fill the Space's PO-token / visitor-data fields

Add PO Token Grabber browser extension (one-click visitor data + gvs PO token)

Add PO-token support (manual PO token + visitor data) with README guide

Add per-user cookies + proxy for YouTube access (UI fields + operator secrets)

Replace keyword density with primary/secondary keyword placement + AEO structure

Add YouTube -> tutorial .docx pipeline (Gradio Space)

initial commit