🐛 Fix: [#32] project 대표 설정 save() 추가

projects/views.py

@@ -86,6 +86,7 @@ class ProjectSetRepresentAPIView(APIView):
         if before_represent := Project.objects.filter(owner=user, is_represent=True).first():
             before_represent.is_represent = False
         project.is_represent = True
+        project.save()
         return Response({"message": "change represent success"}, status=status.HTTP_200_OK)