- Update ExchangeConfigResponse schema with direction-specific fields
- Remove premium_percentage from PriceResponse (now in config)
- Update price endpoint to load pricing config from database
- Update frontend to use direction-specific min/max and calculate premium
- Update tests to seed pricing config
- Add logic to clamp amount when direction changes
- Add PricingConfigResponse and PricingConfigUpdate schemas
- Create PricingService with validation logic
- Add GET and PUT endpoints in routes/pricing.py
- Add MANAGE_PRICING permission to admin role
- Register pricing router in main.py
- Add comprehensive API tests for permissions and validation