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

[pboachie]

🚨 Severity: HIGH
💡 Vulnerability: The demo_login and demo_portal_login endpoints in apps/auth_app/views.py were using the @csrf_exempt decorator unnecessarily.
🎯 Impact: This allowed a potential Login CSRF vulnerability, where a malicious site could forge a POST request to force a user to log into a demo account.
🔧 Fix: Removed @csrf_exempt decorators from both functions. The login forms (templates/auth/login.html) already properly include {% csrf_token %}.
✅ Verification: Tested locally by ensuring all auth and security tests pass. Verified that the forms already contain the required CSRF tokens.

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PR created automatically by Jules for task 1110953642396645353 started by @pboachie

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