fix(auth): Prevent cached stale auth redirects in middleware

[Ayush8923]

Summary

Auth-gating middleware responses were cacheable, so the browser/CDN could replay a stale redirect after the underlying auth cookies changed. The most visible symptom: after logging out (or when the API key cookie was cleared) the user still couldn't reach /keystore, it kept redirecting to /chat until the site cache was manually cleared.

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• Ran npm run dev and npm run build in the repository root and test.
• If you've fixed a bug or added code that is tested

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📥 Commits

Reviewing files that changed from the base of the PR and between 9517392 and a7a5948.

📒 Files selected for processing (1)

• middleware.ts

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch fix/no-cache-stale-auth

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🎉 This PR is included in version 0.3.0-main.9 🎉

The release is available on GitHub release

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