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/tests/test_export_dump_api.py

@@ -0,0 +1,94 @@
+import pytest
+
+from contacts.models import Contact, NetworkMap, NetworkMapMembership, NetworkMapType, Relation
+
+
+@pytest.mark.django_db
+def test_export_dump_empty(api_client):
+    response = api_client.get('/api/v1/export/')
+    assert response.status_code == 200
+    data = response.json()
+    assert data['version'] == 2
+    assert data['contacts'] == []
+    assert data['relations'] == []
+    assert isinstance(data['networkMapTypes'], list)
+    assert isinstance(data['networkMaps'], list)
+    assert isinstance(data['networkMapMemberships'], list)
+
+
+@pytest.mark.django_db
+def test_export_dump_with_data(api_client, two_contacts, sample_relation):
+    response = api_client.get('/api/v1/export/')
+    assert response.status_code == 200
+    data = response.json()
+    assert len(data['contacts']) == 2
+    assert len(data['relations']) == 1
+    assert data['relations'][0]['source'] == sample_relation.source_id
+    assert data['relations'][0]['target'] == sample_relation.target_id
+
+
+@pytest.mark.django_db
+def test_import_dump_replace(api_client, two_contacts, sample_relation):
+    export_response = api_client.get('/api/v1/export/')
+    dump = export_response.json()
+    assert len(dump['contacts']) == 2
+
+    Contact.objects.all().delete()
+    assert Contact.objects.count() == 0
+
+    import_response = api_client.post('/api/v1/export/?replace=true', dump, format='json')
+    assert import_response.status_code == 200
+    result = import_response.json()
+    assert result['importedContacts'] == 2
+    assert result['importedRelations'] == 1
+    assert Contact.objects.count() == 2
+    assert Relation.objects.count() == 1
+
+
+@pytest.mark.django_db
+def test_import_dump_invalid(api_client):
+    response = api_client.post('/api/v1/export/', {'contacts': []}, format='json')
+    assert response.status_code == 400
+    assert 'error' in response.json()
+
+
+@pytest.mark.django_db
+def test_import_dump_with_maps(api_client, db):
+    NetworkMapMembership.objects.all().delete()
+    NetworkMap.objects.all().delete()
+    NetworkMapType.objects.all().delete()
+
+    map_type = NetworkMapType.objects.create(
+        name='Базовый',
+        sectors=[{'id': 'work', 'label': 'Работа'}],
+        circles=[{'id': 'close', 'label': 'Близкий'}],
+        is_default=True,
+    )
+    contact = Contact.objects.create(name='Алиса')
+    network_map = NetworkMap.objects.create(
+        name='Основная',
+        description='Тест',
+        map_type=map_type,
+    )
+    network_map.memberships.create(
+        contact=contact,
+        life_sphere='work',
+        network_circle='close',
+        importance=4,
+    )
+
+    dump = api_client.get('/api/v1/export/').json()
+    assert len(dump['contacts']) == 1
+    assert len(dump['networkMaps']) == 1
+    assert len(dump['networkMapMemberships']) == 1
+
+    Contact.objects.all().delete()
+    NetworkMap.objects.all().delete()
+    NetworkMapType.objects.all().delete()
+
+    result = api_client.post('/api/v1/export/?replace=true', dump, format='json').json()
+    assert result['importedContacts'] == 1
+    assert result['importedMaps'] == 1
+    assert result['importedMemberships'] == 1
+    assert NetworkMapType.objects.count() == 1
+    assert NetworkMap.objects.count() == 1