feat(auth): auto-login user on successful registration via secure auth cookie

[KGFCH2]

What changed

• Updated registration route to set secure auth cookie
• Ensured sign-up flow transitions directly into authenticated state

Why

This improves onboarding and avoids insecure client-side token handling.

Testing

• Register a new user
• Confirm the user is authenticated automatically
• Verify no insecure client-side auth token is stored

Checklist

• Registration flow logs user in
• Secure auth cookie is set
• No unsafe client-side auth token usage

Closes #33

[vercel]

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ℹ️ Review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro

Run ID: b6b7862c-9d83-46b4-b2fa-999049f29d8f

📥 Commits

Reviewing files that changed from the base of the PR and between dcfb7ee and 6b398c2.

📒 Files selected for processing (1)

• gsecure/app/api/v1/auth/register/route.js

✨ Finishing Touches

🧪 Generate unit tests (beta)

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