fix(deps): sync package-lock for agentmail deps (#86) to unblock npm ci

PR #86 added imapflow, nodemailer, mailparser (+types) to commandboard-api
but did not refresh package-lock.json, so Railway's `npm ci` failed with
EUSAGE (lockfile out of sync). Regenerate the lockfile; no package.json change.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

Author: ralyodio