fix(openai): honor x-session-affinity in session hash and upstream session injection for better OpenCode request sticky and higher cache hit rate#1578
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…jection Cherry-pick from upstream PR Wei-Shaw#1578 (Wei-Shaw/sub2api) Adds x-session-affinity header support (used by OpenCode) to session hash generation and upstream request building. Improves cache hit rate from ~1x% to 90%+ for OpenCode requests. Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
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x-session-affinity 是 OpenCode 使用的 session 标记请求头。
本项目中将 OpenCode 作为和 Codex CLI 并列的客户端推荐，应当支持 OpenCode 使用的标记请求头。进行此变更后在我自己的实例上可以将 OpenCode相关请求的缓存命中率从 1x%提高到 90%+。（顺带一提，现在的缓存命中率计算也是错误的）
Summary
x-session-affinitybetweenconversation_idandprompt_cache_keywhen extracting the effective OpenAI session signalsession_id/conversation_idinjectionTesting
go test ./internal/service -run "GenerateSessionHash_UsesXSessionAffinity|ExtractSessionID_PrefersXSessionAffinity|BuildUpstreamRequest_UsesXSessionAffinity" -count=1