Door walk-ins were only expressible as an unpaid ticket, which left the
cash out of revenue. The new type records the cash payment as paid and
makes every field optional, since a walk-in often gives no details:
a blank name is logged as "Walk-in", and a confirmation email only goes
out when an email is entered.
Door tickets reuse paymentStatus 'paid' (the column enum is capped at
paid/unpaid/comp) so badges and revenue totals pick them up with no
migration; the cash payment row is referenced "Paid at door" to keep
them distinguishable from emailed manual tickets.
Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
