- Add ampcodeApi service for upstream URL, API key, and model mappings management
- Implement Ampcode configuration modal in AiProvidersPage
- Add complete i18n translations for Ampcode features (en and zh-CN)
- Enhance UsagePage with mobile-responsive chart improvements and legend display
- Optimize chart rendering for smaller screens
- Improve page layout styles (SystemPage, AiProvidersPage alignment)
- Remove inset box-shadow from stat badges for cleaner appearance
- Add modelCountLabel style for consistent model count display
- Refactor model count layout in AiProvidersPage
- Add openaiTestButton style for proper button height alignment
- Add item-actions flexbox utility style to layout.scss