- 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)
- Reorganize retry settings into separate Card for better visual hierarchy
- Move retry update button inline with input field via rightElement
- Add excluded-models serialization in provider key configuration
- Add excluded-models normalization support in API transformers with fallback parsing