Update prisma schema

prisma/schema.prisma

@@ -24,9 +24,3 @@ model ChatHistory {
   id       String @id @unique @map("_id")
   messages String @default("[]") // JSON messages
 }
-
-model Token {
-  userId    String @id @relation(fields: [userId], references: [id])
-  token     String
-  createdAt DateTime @default(now())
-}