feat: add user management viewset and sync module to API routes

sync/api_views.py

@@ -0,0 +1,14 @@
+from rest_framework import viewsets
+from .models import ChangeLog
+from .serializers import ChangeLogSerializer
+
+class ChangeLogViewSet(viewsets.ReadOnlyModelViewSet):
+    queryset = ChangeLog.objects.all()
+    serializer_class = ChangeLogSerializer
+
+    def get_queryset(self):
+        queryset = super().get_queryset()
+        since_id = self.request.query_params.get('since_id')
+        if since_id:
+            queryset = queryset.filter(id__gt=since_id)
+        return queryset