phsl / new-api

- Updated the GetPricing function in the backend to include user group information, allowing for dynamic adjustment of group ratios based on the user's group.
- Implemented logic to filter group ratios based on the user's usable groups, improving the accuracy of pricing data returned.
- Modified the ModelPricing component to utilize the new usable group data, ensuring only relevant groups are displayed in the UI.
- Enhanced state management in the frontend to accommodate the new usable group information, improving user experience and data consistency.