fix: guest and admin logic

backend/prisma/migrations/20260622012027_add_photo_flagging/migration.sql

@@ -0,0 +1,4 @@
+-- AlterTable
+ALTER TABLE "Photo" ADD COLUMN     "flaggedAt" TIMESTAMP(3),
+ADD COLUMN     "flaggedReason" TEXT,
+ADD COLUMN     "isFlagged" BOOLEAN NOT NULL DEFAULT false;

backend/prisma/schema.prisma

@@ -209,6 +209,9 @@ model Photo {
   capturedAt   DateTime     @default(now())
   metadata     Json?
   privacy      PrivacyLevel @default(TOUR_ONLY)
+  isFlagged    Boolean      @default(false)
+  flaggedReason String?
+  flaggedAt    DateTime?
 
   tour         Tour?        @relation(fields: [tourId], references: [id], onDelete: SetNull)
   location     Location?    @relation(fields: [locationId], references: [id], onDelete: SetNull)