- Add "获取模型" button: fetches /v1/models and populates datalist autocomplete
- Add "测试连接" button: tries GET /models first (free), falls back to minimal
type-specific request if endpoint unsupported; shows inline result
- Google AI Studio: auto-fill fixed endpoint URL, hide URL field, fetch models
via native v1beta/models?key= API, test via same endpoint
- Collapse Chat/Embedding/Rerank advanced params into <details> sections
- Simplify provider options: remove ambiguous "实验性全兼容" option
- Clear test result and model datalist cache on each modal open
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>