fix fund fk on deletes

src/app/api/admin/funds/[fundId]/route.ts

@@ -90,7 +90,9 @@ export async function DELETE(
   const fund = await prisma.hedgeFund.findUnique({ where: { id: params.fundId } })
   if (!fund) return NextResponse.json({ error: 'Fund not found.' }, { status: 404 })
 
-  // Delete shadow user cascades positions, trades, and the fund record
+  // Must delete fund first (it holds the FK to User), then delete the shadow user
+  // (which cascades positions and trades).
+  await prisma.hedgeFund.delete({ where: { id: fund.id } })
   await prisma.user.delete({ where: { id: fund.userId } })
 
   return NextResponse.json({ ok: true })