Kyle Isom 37afc68287 Add TOTP enrollment to web UI ...

- Profile page TOTP section with enrollment flow:
  password re-auth → QR code + manual entry → 6-digit confirm
- Server-side QR code generation (go-qrcode, data: URI PNG)
- Admin "Remove TOTP" button on account detail page
- Enrollment nonces: sync.Map with 5-minute TTL, single-use
- Template fragments: totp_section.html, totp_enroll_qr.html
- Handler: handlers_totp.go (enroll start, confirm, admin remove)

Security: Password re-auth before secret generation (SEC-01).
Lockout checked before Argon2. CSRF on all endpoints. Single-use
enrollment nonces with expiry. TOTP counter replay prevention
(CRIT-01). Self-removal not permitted (admin only).

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

2026-03-16 17:39:45 -07:00

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