phsl / new-api

- Break down monolithic ModelPricing.js (685 lines) into focused components:
  * ModelPricingHeader.jsx - top status card with pricing information
  * ModelPricingTabs.jsx - model category navigation tabs
  * ModelPricingFilters.jsx - search and action controls
  * ModelPricingTable.jsx - data table with pricing details
  * ModelPricingColumnDefs.js - table column definitions and renderers

- Create custom hook useModelPricingData.js for centralized state management:
  * Consolidate all business logic and API calls
  * Manage pricing calculations and data transformations
  * Handle search, filtering, and UI interactions

- Follow project conventions matching other table components:
  * Adopt same file structure as channels/, users/, tokens/ modules
  * Maintain consistent naming patterns and component organization
  * Preserve all original functionality including responsive design

- Update import paths:
  * Remove obsolete ModelPricing.js file
  * Update Pricing page to use new ModelPricingPage component
  * Fix missing import references

Benefits:
- Improved maintainability with single-responsibility components
- Enhanced code reusability and testability
- Better team collaboration with modular structure
- Consistent codebase architecture across all table components