D1 edition โ€” parallel test build on Cloudflare Workers + D1

๐Ÿ“Š Dashboard owner consoleโ†’ โ˜• POS cashierโ†’ ๐Ÿงพ Pending barista queueโ†’ ๐Ÿ–ฅ Customer screen cart mirrorโ†’
PHASE 3 โ€” DASHBOARD