feat(auth, settings): Add MFA guard to 2FA setup from settings
commit 0982fb77c394f8cbb133bf2236d2a294209bbbef Author: Valerie PomerleauDate: Mon Sep 8 15:57:35 2025 -0700 feat(auth, settings): Add MFA guard to 2FA setup from settings Because: * We want to guard the totp creation endpoints and flow This commit: * Add MFA authentication variants of the 2FA setup endpoints (existing endpoints conserved for inline flow) * Add MFA guard to 2FA setup from settings Closes #FXA-12229