feat: implement flexible feeding intervals and fix layout alignment

prisma/schema.prisma

@@ -16,6 +16,9 @@ model Plan {
   instructions String?
   webhookUrl   String?
   notifyAll    Boolean  @default(true)
+  feedingPerDay Int     @default(2)
+  feedingInterval Int    @default(1)
+  litterInterval Int     @default(2)
   createdAt    DateTime @default(now())
   bookings     Booking[]
 }