feat: add three creator monetization patterns for affiliate and commerce analysis

# CHANGES

- Add `analyze_monetization_opportunities` pattern for creator revenue strategy
- Add `extract_affiliate_products` pattern for surfacing affiliate opportunities
- Add `extract_video_commerce_entities` pattern for video transcript commerce
- Register new patterns in `pattern_descriptions.json` with appropriate tags
- Add full pattern extracts to `pattern_extracts.json` for each addition
- Update `pattern_explanations.md` with descriptions of three new patterns