feat: add comprehensive tests for token candidates and proxy log path metadata

- Implemented tests for the `/api/models/token-candidates` endpoint to verify model availability and token coverage scenarios.
- Added tests for `composeProxyLogMessage` to ensure proper formatting of log messages with downstream and upstream metadata.
- Created utility functions for parsing proxy log path metadata and handling missing token hints.
- Developed tests for the `Sites` and `TokenRoutes` components to validate UI behavior and interactions, including scrolling and group expansion.
- Introduced a custom hook `useAnimatedVisibility` for managing visibility animations in components.
- Enhanced the documentation link for site resources.

README.md

@@ -349,7 +349,7 @@ Metapi 完全自托管，所有数据（账号、令牌、路由、日志）均
 
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