- 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
- Create PricingConfig model with all required fields (premium settings, trade limits)
- Implement PricingRepository with singleton pattern (get_current, create_or_update)
- Add comprehensive tests for repository functionality
- Export model and repository in __init__.py files