feat: tenant model, seeder, and product search with distance
Tenant Model:
- Renamed Company→Tenant (Company alias for compatibility)
- Added: lat/lng, city, state, category
- Updated: postgres, handlers, DTOs, schema SQL
Seeder (cmd/seeder):
- Generates 400 pharmacies in Anápolis/GO
- 20-500 products per tenant
- Haversine distance variation ±5km from center
Product Search:
- GET /products/search with advanced filters
- Filters: price (min/max), expiration, distance
- Haversine distance calculation (approx km)
- Anonymous seller (only city/state shown until checkout)
- Ordered by expiration date (nearest first)
New domain types:
- ProductWithDistance, ProductSearchFilter, ProductSearchPage
- HaversineDistance function
Updated tests for Category instead of Role
4bb848788f