Add relations export and remote full backup/restore.

Expose GET/POST /api/v1/export/ for server dumps and add import UI for relations (CSV/JSON) plus remote backup controls.

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

backend/import_export/views.py

@@ -4,9 +4,38 @@ from rest_framework.views import APIView
 
 from core.access import use_jwt_auth
 from core.drf_mixins import JwtAuthMixin
+from .dump_services import build_owner_dump, import_owner_dump, is_data_dump, parse_dump_request
 from .services import parse_upload_file, import_contacts_from_rows
 
 
+class ExportDumpView(JwtAuthMixin, APIView):
+    def get(self, request):
+        owner = request.user if use_jwt_auth() and request.user.is_authenticated else None
+        return Response(build_owner_dump(owner))
+
+    def post(self, request):
+        data, error = parse_dump_request(request)
+        if error:
+            return Response({'error': error}, status=status.HTTP_400_BAD_REQUEST)
+        if not is_data_dump(data):
+            return Response(
+                {'error': 'Некорректный формат бэкапа: ожидаются массивы contacts и relations.'},
+                status=status.HTTP_400_BAD_REQUEST,
+            )
+        replace = str(request.query_params.get('replace', '')).lower() in ('1', 'true', 'yes')
+        owner = request.user if use_jwt_auth() and request.user.is_authenticated else None
+        try:
+            summary = import_owner_dump(owner, data, replace=replace)
+            return Response(summary)
+        except ValueError as exc:
+            return Response({'error': str(exc)}, status=status.HTTP_400_BAD_REQUEST)
+        except Exception as exc:
+            return Response(
+                {'error': f'Ошибка импорта бэкапа: {exc}'},
+                status=status.HTTP_400_BAD_REQUEST,
+            )
+
+
 class ImportContactsView(JwtAuthMixin, APIView):
     def post(self, request):
         file = request.FILES.get('file')