* add k3s update center
* fix update center status timeouts
* Polish update center settings UI
* Document k3s update center
* Refocus update center docs for users
* Clarify k3s migration path in docs
- Added support for preserving native response.compaction payloads when compact serialization is requested in `serializeResponsesFinalPayload`.
- Implemented serialization of compact mode as `response.compaction` instead of an ordinary response object.
- Introduced a new type `ResponsesFinalSerializationMode` to manage serialization modes.
- Refactored `serializeResponsesFinalPayload` to handle different serialization modes and usage payloads.
- Added tests to ensure correct behavior for compact serialization and preservation of upstream payloads.
- Updated favicon assets and documentation configuration for VitePress.
- Updated modelTesterSession tests to serialize assistant history as output_text and removed mime_type from input_file.
- Introduced new tests for stats proxy logs routes, covering paginated log retrieval and detailed log views with parsed billing details.
- Added server-driven tests for ProxyLogs component to validate API interactions and UI rendering based on server data.
- Implement tests for TokenRouter downstream policy, covering allowedRouteIds and site weight multipliers.
- Add tests for TokenRouter patterns and model mapping, including regex pattern matching and model mapping precedence.
- Create tests for BrandIcon component to verify brand detection logic.
- Develop tests for Accounts page, focusing on rebind panel behavior and refresh action on error.
- Introduce fuzzy search utility tests to validate substring and subsequence matching.
- Implement navigation focus helpers tests for building and parsing focus paths.
- Add progressive render tests to ensure correct initial and next visible counts.
- Create route model candidates index tests to validate route candidate indexing and matching logic.
- Introduced `isPinned` and `sortOrder` fields in the `accounts` and `sites` tables to allow users to pin and sort their accounts and sites.
- Updated API routes to handle pinning and sorting operations for accounts and sites.
- Enhanced the frontend to support sorting by balance and custom order, as well as toggling the pin status of accounts and sites.
- Added tests for sorting and reordering logic to ensure correct functionality.
- Updated documentation to reflect changes in token management and new features.
Cita