ed7f839911
- Backend: differentiate error messages for admin vs regular users in price.go - Backend: include error_code in channel test response for structured error handling - Frontend: render model_price_error as a styled card in Playground with admin nav button - Frontend: show inline error details and settings link in channel test modal - Frontend: parse error codes from both SSE and non-streaming API responses - i18n: remove redundant "Settings" suffix from setting tab translations (en/fr/ru/ja/vi) - i18n: update "Group & Model Pricing" translations across all locales