rendering data as graphs: WARDEN_GITHUB_VERIFIER_SECRET env variable not set

Guide doesn't mention it, code doesn't mention. Unable to build server without it
> No WARDEN_GITHUB_VERIFIER_SECRET environmental variable found.
> Your sessions are likely being stored insecurely.

從伺服器建置入口點和設定指南開始，然後在儲存庫中搜尋 WARDEN_GITHUB_VERIFIER_SECRET 和加上引號的警告。透過重現建置失敗來確認所需的設定流程；當指南和相關伺服器文件一致說明此變數及後續處理方式時，即表示完成。

由索引模型根據 Issue 內容生成。