- Added validation logic in `UpdatePricingSettingsCommandValidator` to ensure the annual price does not fall below the equivalent quarterly price, preventing potential pricing discrepancies. - Updated `PricingSettings` model documentation to clarify that both pricing fields represent monthly rates, with calculations for total costs based on the number of months. - Modified frontend components to reflect the new validation, including error messages when the annual price is cheaper than the quarterly price. - Adjusted API documentation to accurately describe the pricing structure and validation rules for the pricing endpoints.