fix: removed isAIReviewer from challenge schema

Author: hentrymartin

prisma/challenge.schema.prisma

@@ -619,15 +619,15 @@ model DefaultChallengeReviewer {
   typeId              String
   trackId             String
   // Reviewer configuration (mirrors ChallengeReviewer)
-  scorecardId         String
+  scorecardId         String?
   isMemberReview      Boolean
   memberReviewerCount Int?
   phaseName           String
   fixedAmount           Float? @default(0)
   baseCoefficient           Float?
   incrementalCoefficient    Float?
   opportunityType     ReviewOpportunityTypeEnum?
-  isAIReviewer        Boolean
+  aiWorkflowId        String?
   // Default for whether to open a public review opportunity for this reviewer when a challenge is created
   shouldOpenOpportunity Boolean @default(true)