feat: schema for logistics hotels + flight tracking

Adds 2 new models for grand-finale logistics PR 2:
- Hotel: 1:1 with Program (one per edition); name + address + link + notes
- FlightDetail: 1:1 with AttendingMember; arrival + departure datetimes,
  flight numbers, airports, admin status (PENDING/CONFIRMED), admin notes

Migration is purely additive: no DROP/ALTER COLUMN/RENAME. FKs point
FROM new tables TO existing tables (Program, AttendingMember) with
ON DELETE CASCADE only firing on parent deletion.

prisma/schema.prisma

@@ -505,6 +505,7 @@ model Program {
   // Grand-finale logistics
   finalistSlotQuotas FinalistSlotQuota[]
   waitlistEntries    WaitlistEntry[]
+  hotel              Hotel?
 
   @@unique([name, year])
   @@index([status])
@@ -2722,7 +2723,49 @@ model AttendingMember {
 
   confirmation FinalistConfirmation @relation(fields: [confirmationId], references: [id], onDelete: Cascade)
   user         User                 @relation(fields: [userId], references: [id], onDelete: Cascade)
+  flightDetail FlightDetail?
 
   @@unique([confirmationId, userId])
   @@index([userId])
 }
+
+// ─────────────────────────────────────────────────────────────────────────────
+// Grand-finale logistics (PR 2: hotels + flight tracking)
+// ─────────────────────────────────────────────────────────────────────────────
+
+enum FlightDetailStatus {
+  PENDING // team submitted details, admin not yet reviewed
+  CONFIRMED // admin verified booking
+}
+
+model Hotel {
+  id        String   @id @default(cuid())
+  programId String   @unique // 1:1 — one hotel per edition
+  name      String
+  address   String?  @db.Text
+  link      String? // external URL to hotel page / booking confirmation
+  notes     String?  @db.Text
+  createdAt DateTime @default(now())
+  updatedAt DateTime @updatedAt
+
+  program Program @relation(fields: [programId], references: [id], onDelete: Cascade)
+}
+
+model FlightDetail {
+  id                    String             @id @default(cuid())
+  attendingMemberId     String             @unique // 1:1
+  arrivalAt             DateTime?
+  arrivalFlightNumber   String?
+  arrivalAirport        String?
+  departureAt           DateTime?
+  departureFlightNumber String?
+  departureAirport      String?
+  status                FlightDetailStatus @default(PENDING)
+  adminNotes            String?            @db.Text
+  createdAt             DateTime           @default(now())
+  updatedAt             DateTime           @updatedAt
+
+  attendingMember AttendingMember @relation(fields: [attendingMemberId], references: [id], onDelete: Cascade)
+
+  @@index([status])
+}