feat(quest): add support for private images in answers

prisma/schema.prisma

@@ -1,7 +1,7 @@
 generator client {
-  provider = "prisma-client"
+  provider   = "prisma-client"
   engineType = "client"
-  output = "../shared/generated/prisma"
+  output     = "../shared/generated/prisma"
 }
 
 datasource db {
@@ -42,9 +42,10 @@ enum UserRole {
 }
 
 model File {
-  id   Int    @id @default(autoincrement())
-  uuid String
-  url  String
+  id      Int     @id @default(autoincrement())
+  uuid    String
+  url     String
+  private Boolean @default(false)
 
   creator   User @relation(fields: [creatorId], references: [id], onUpdate: Cascade, onDelete: Cascade)
   creatorId Int