🛡️ Sentinel: [HIGH] Fix Login CSRF vulnerability on demo endpoints

[pboachie]

🚨 Severity: HIGH
💡 Vulnerability: The demo_login and demo_portal_login POST endpoints in apps/auth_app/views.py were annotated with @csrf_exempt, bypassing Django's built-in Cross-Site Request Forgery (CSRF) protection.
🎯 Impact: This exposes the application to a Login CSRF vulnerability, allowing an attacker to force a victim's browser to authenticate as a demo user.
🔧 Fix: Removed the @csrf_exempt decorator from the two endpoints and the unused import. Django's default CSRF middleware will now protect these routes, and the existing {% csrf_token %} in the forms will be validated.
✅ Verification: Ran the authentication test suite, including tests/test_roles_invites.py and tests/test_auth_views.py, to verify that login functionality is maintained.

---

PR created automatically by Jules for task 14659721983192542492 started by @pboachie

[google-labs-jules]

👋 Jules, reporting for duty! I'm here to lend a hand with this pull request.

When you start a review, I'll add a 👀 emoji to each comment to let you know I've read it. I'll focus on feedback directed at me and will do my best to stay out of conversations between you and other bots or reviewers to keep the noise down.

I'll push a commit with your requested changes shortly after. Please note there might be a delay between these steps, but rest assured I'm on the job!

For more direct control, you can switch me to Reactive Mode. When this mode is on, I will only act on comments where you specifically mention me with @jules. You can find this option in the Pull Request section of your global Jules UI settings. You can always switch back!

New to Jules? Learn more at jules.google/docs.

---

For security, I will only act on instructions from the user who triggered this task.