BUG-002 — Terms and conditions checkbox is not validated

Priority: Critical
Severity: Blocker
Environment: Chrome 128, desktop
Steps to reproduce:
1. Fill in all form fields with valid data
2. Do not check the "I agree to the Terms of Service" checkbox
3. Click "Create account"
Expected result: The form blocks submission and shows an error below the checkbox
Actual result: The form submits successfully, as if consent had been given
Impact: Legal risk — a user can register without accepting the terms of service