Milestone 1: Complete backend feature with:
- Migration with CHECK (amount > 0) constraint
- Repository with mapRow() for snake_case -> camelCase
- Service with CRUD and vehicle authorization
- Controller with HTTP handlers
- Routes registered at /api/ownership-costs
- Validation with Zod schemas
- README with endpoint documentation
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Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
