Release 1.6.0 — add two-factor-pin template

Added

• two-factor-pin email template (src/Templates/html/two-factor-pin.html): Renders the 6-digit PIN for the framework's core email-PIN 2FA feature (Glueful Framework 1.45.0 "Fomalhaut"). Mirrors the existing password-reset/verification templates ({{> header}} / {{> footer}} partials) and uses the {{pin}} and {{ttl_minutes}} variables dispatched by TwoFactorService.

Notes

• No breaking changes; no API changes. Purely additive — the template is only used when paired with Glueful Framework 1.45.0+ and TWO_FACTOR_ENABLED=true. Older framework versions simply ignore the unused template.
• Framework requirement unchanged (>=1.30.0).