sync-upstream-zh-docs

Sync the embedded affaan-m/ECC clone under everything-claude-code/ to upstream, then refresh the top-level Chinese tutorial docs (README.md, ECC-COMMANDS-ZH.md, ECC-NAVIGATION-ZH.md) for any stale counts, new language tracks, or new commands. Use when the user asks to "同步上游", "刷新中文文档", "维护教程", or after noticing the upstream VERSION / count drift.