feat: add realtime

apps/api/prisma/migrations/20261008120000_planned_tab_delivered/migration.sql

@@ -0,0 +1,2 @@
+-- AlterTable
+ALTER TABLE "PlannedTab" ADD COLUMN     "deliveredAt" TIMESTAMP(3);

apps/api/prisma/schema.prisma

@@ -152,6 +152,8 @@ model PlannedTab {
   email        String?
   position     Int      @default(0)
   createdAt    DateTime @default(now())
+  // Set once the terminal reports an open tab with this name; it is then no longer sent to devices
+  deliveredAt  DateTime?
 
   venue Venue @relation(fields: [venueId], references: [id])