Phase 3a of migration #2: syncs FILEBROWSER_USERS from homelab/prod /filebrowser
via read-only infisical-operator/infisical-auth, template-remapped to the
lowercase 'users' key Traefik basic-auth requires, into parallel-name
filebrowser-auth-infisical. Old plaintext filebrowser-auth secret + the Traefik
Middleware untouched (repoint=3b, removal of the Secret stanza=3c).
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
