Claude-code-router

## Highlights

- Fix Codex workspace launching and network requirements handling, and preserve approval reviewer settings.
- Protect configuration saves against stale concurrent edits and preserve provider capabilities, routing rules, and fallback settings.
- Bundle the gateway regression fixes in every release: valid Anthropic tool IDs and replay histories, complete Fusion traces, and accurate upstream HTTP status and headers.
- Improve fallback error details, Anthropic reasoning compatibility, OpenCode Go cache usage, and live OAuth credential refresh during model discovery and requests.
- Keep tool results paired during Claude Code context compaction and improve Windows launcher argument escaping.
- Support public OpenCode Zen free-tier imports and Serply Fusion web search.
- Improve request log recovery and activity heatmap sizing in the main window and tray.
- Update both English and Chinese README download links to v3.1.2.

## What's Changed
* docs: add international Kimi Code link (kimi.ai/code) to README and README_zh by @ysntony in https://github.com/musistudio/claude-code-router/pull/1812
* fix: resolve 403 FreeTierError on public OpenCode Zen providers by @diogomcd in ht