FREYA-1532: Add contact form

[Ziip-dev]

📋 Summary

This PR add a contact page with a contact form.

🛠️ Changes Made

• add new contact app
• add basic email configuration in dev and prod settings (placeholders, replaceable from .env)
• add contact form template, class and view
• add tests to verify form security

🔍 Notes for Reviewers

You can run the tests via DATABASE_URL=sqlite:///db.sqlite3 python manage.py test pages.contact.tests -v 2 to verify everything at once.
Then you can manually submit the contact form and the resulting email will be displayed in the server's console.

✅ Checklist

• PR title follows the pattern: FREYA-XXXX: Clear and short description
• Jira / Github issue is linked in description
• Assignee is selected
• Automated checks pass
• Reviewer is selected when the PR is marked as ready for review

🔗 Jira Issue

Closes: FREYA-1532