Implement AnimalTagged and AnimalTagEnded event handling:
- Add migration for tag_suggestions table
- Create TagProjection for tag intervals and suggestions
- Update EventAnimalsProjection to handle tag events
- Add add_tag() and end_tag() to AnimalService
Key behaviors:
- No-op idempotence (adding active tag or ending inactive tag)
- Updates live_animals_by_location.tags JSON array
- Tracks tag usage statistics in tag_suggestions
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Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
