Add database tables for animal tracking:
- animal_registry: main snapshot table with all animal attributes
- live_animals_by_location: denormalized view for fast roster queries
- animal_aliases: merge tracking for when animals are discovered to be same
Includes Pydantic models and comprehensive tests for all constraints.
🤖 Generated with [Claude Code](https://claude.com/claude-code)
Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
