- Remove CostInterval type and TCOResponse interface from frontend types
- Remove insurance/registration cost fields from VehicleForm schema and UI
- Keep purchasePrice and purchaseDate fields on vehicle form
- Remove TCODisplay component from VehicleDetailPage
- Delete TCODisplay.tsx component file
- Remove getTCO method from vehicles API client
Legacy TCO fields moved to ownership-costs feature in #29.
Backend endpoint preserved for future reporting feature.
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Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>