Add admin portal

apps/backend/prisma/court.prisma

@@ -34,6 +34,8 @@ model Court {
   name                String
   slotDurationMinutes Int                 @map("slot_duration_minutes")
   basePrice           Decimal             @map("base_price") @db.Decimal(19, 2)
+  isUnderMaintenance  Boolean             @default(false) @map("is_under_maintenance")
+  maintenanceReason   String?             @map("maintenance_reason") @db.VarChar(500)
   createdAt           DateTime            @default(now()) @map("created_at")
   updatedAt           DateTime            @updatedAt @map("updated_at")
   complex             Complex             @relation(fields: [complexId], references: [id], onDelete: Cascade)
@@ -41,12 +43,28 @@ model Court {
   availabilities      CourtAvailability[]
   priceRules          CourtPriceRule[]
   bookings            CourtBooking[]
+  maintenances        CourtMaintenance[]
 
   @@index([complexId])
   @@index([sportId])
   @@map("courts")
 }
 
+model CourtMaintenance {
+  id        String   @id @db.Uuid
+  courtId   String   @map("court_id") @db.Uuid
+  startDate DateTime @map("start_date") @db.Date
+  startTime String?  @map("start_time") @db.VarChar(5)
+  endTime   String?  @map("end_time") @db.VarChar(5)
+  reason    String?  @db.VarChar(500)
+  createdAt DateTime @default(now()) @map("created_at")
+  updatedAt DateTime @updatedAt @map("updated_at")
+  court     Court    @relation(fields: [courtId], references: [id], onDelete: Cascade)
+
+  @@index([courtId, startDate])
+  @@map("court_maintenances")
+}
+
 model CourtAvailability {
   id        String    @id @db.Uuid
   courtId   String    @map("court_id") @db.Uuid