feature: Adds username support.

LOM eta wen

api/prisma/schema.prisma

@@ -45,9 +45,10 @@ model User {
   id Int @id @default(autoincrement())
 
   email                String  @unique
+  username             String? // NOT optional in the API, but just for backwards compat
   name                 String
   password             String // Will be hashed using bcrypt
   rootToken            String?
   isRootServiceAccount Boolean?
   permissions          Permission[]
-}
+}