🔒 Prevent JWT secret leakage in token cache

[is0692vs]

🎯 What: Removed the JWT_SECRET from the in-memory token cache key.
⚠️ Risk: If memory dumps occur or the cache is accessed maliciously, the JWT_SECRET could be exposed. This could allow attackers to forge JWT tokens and gain unauthorized access.
🛡️ Solution: Used rawToken directly as the cache key, which is unique to each user session and sufficient for caching purposes without exposing sensitive secrets.

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PR created automatically by Jules for task 4378765710524347307 started by @is0692vs

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1 Skipped Deployment

Project	Deployment	Actions	Updated (UTC)
open-shelf	Ignored		Jun 28, 2026 3:54pm

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[github-actions]

このリポジトリでは staging 先行フローを採用しています。PR のターゲットを staging に変更しました。staging で動作確認後、staging → main の PR を作成してください。

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ All tests successful. No failed tests found.

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