Add settings page and configurable network map types.

Let users define sector/circle labels and geometry per map type, choose a type when creating maps, and sync types through local backup and API migrations.

Co-authored-by: Cursor <cursoragent@cursor.com>

backend/contacts/views.py

@@ -1,11 +1,13 @@
 from rest_framework import viewsets
+from rest_framework.exceptions import ValidationError
 
-from .models import Contact, Relation, NetworkMap, NetworkMapMembership
+from .models import Contact, Relation, NetworkMap, NetworkMapMembership, NetworkMapType
 from .serializers import (
     ContactSerializer,
     RelationSerializer,
     NetworkMapSerializer,
     NetworkMapMembershipSerializer,
+    NetworkMapTypeSerializer,
 )
 
 
@@ -27,10 +29,22 @@ class RelationViewSet(viewsets.ModelViewSet):
 
 
 class NetworkMapViewSet(viewsets.ModelViewSet):
-    queryset = NetworkMap.objects.all()
+    queryset = NetworkMap.objects.select_related('map_type').all()
     serializer_class = NetworkMapSerializer
 
 
+class NetworkMapTypeViewSet(viewsets.ModelViewSet):
+    queryset = NetworkMapType.objects.all()
+    serializer_class = NetworkMapTypeSerializer
+
+    def perform_destroy(self, instance):
+        if instance.is_default:
+            raise ValidationError({'detail': 'Нельзя удалить тип карты по умолчанию.'})
+        if instance.maps.exists():
+            raise ValidationError({'detail': 'Тип используется картами сети. Сначала смените тип у карт.'})
+        instance.delete()
+
+
 class NetworkMapMembershipViewSet(viewsets.ModelViewSet):
     serializer_class = NetworkMapMembershipSerializer