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#4: scheduled meetings can now invite people who aren't on Connect. - SMTP config (config.js, env-gated: SMTP_HOST/PORT/USER/PASS/FROM/SECURE, PUBLIC_BASE_URL) + a small nodemailer wrapper (mailer.js) with a branded meeting-invite template carrying the guest join link. No-op until SMTP is set. - /api/meetings/schedule + /update accept participantEmails; external emails are persisted (scheduled_meetings.guest_emails migration) and emailed the guest link (plus any invited Connect users with an email on file). Fire-and-forget — a mail outage never fails scheduling. - Meetings list DTO returns `link`; schedule form gains an "Invite by email" chip input; each scheduled-meeting card gets a "Copy link" action. Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>