phsl / new-api

- Replace model count with group ratio display (x2.2, x1) in group filter
- Remove redundant "Available Groups" column from pricing table
- Remove "Availability" column and related logic completely
- Move "Supported Endpoint Types" column to fixed right position
- Clean up unused parameters and variables in PricingTableColumns.js
- Optimize variable declarations (let → const) and simplify render logic
- Improve code readability and reduce memory allocations

This refactor enhances user experience by:
- Providing clearer group ratio information in filters
- Simplifying table layout while maintaining essential functionality
- Improving performance through better code organization

Breaking changes: None