Manage registrations: tick registrations (or all shown) and message
them (email/WhatsApp event update), mark them paid (the balance, by
method), move them to another ticket (same tickets and QR codes,
repriced, places checked), put their people in a room or group, export
to Excel, or cancel. Each runs the same handlers as doing it one at a
time, with a result per registration. POST /api/registrations/bulk,
campus-checked per id. Migration 20261028170000_registrations_bulk.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
joshuaandClaude Opus 5.5
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