Adds a Require2FA toggle to organization settings. When enabled,
org members without 2FA are redirected to the security settings
page with a warning flash message.
Changes:
- New Require2FA field on User model (migration v333)
- Org settings UI checkbox with shield-lock icon
- Check2FARequirement middleware on member-required org routes
- UpdateOptions extended with Require2FA field
Closes#208
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>