Add twitter_service.py using Twitter's internal GraphQL API with
guest token authentication (free, no API key needed). Fetches
followers, tweets, bio, location, media count, and more.
Integrated into social audit enrichment with _twitter_extra data
stored in content_types JSONB, displayed on audit detail cards.
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>