Add plugin platform with modular backend and frontend registry.

Split graph/import/meta into Django apps, add API v1 with OpenAPI and pytest, and introduce plugin registry with the tags reference plugin on both FE and BE.

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

backend/tests/__init__.py

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+

backend/tests/test_contacts_api.py

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+import pytest
+from django.urls import reverse
+
+
+@pytest.mark.django_db
+def test_contacts_list(api_client, sample_contact):
+    response = api_client.get('/api/v1/contacts/')
+    assert response.status_code == 200
+    assert response.data['count'] == 1
+    assert response.data['results'][0]['name'] == 'Иван Иванов'
+
+
+@pytest.mark.django_db
+def test_contact_create(api_client):
+    response = api_client.post('/api/v1/contacts/', {'name': 'Новый контакт'}, format='json')
+    assert response.status_code == 201
+    assert response.data['name'] == 'Новый контакт'
+
+
+@pytest.mark.django_db
+def test_relations_list(api_client, sample_relation):
+    response = api_client.get('/api/v1/relations/')
+    assert response.status_code == 200
+    assert response.data['count'] == 1

backend/tests/test_graph_api.py

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+import pytest
+
+
+@pytest.mark.django_db
+def test_graph_empty(api_client):
+    response = api_client.get('/api/v1/graph/')
+    assert response.status_code == 200
+    assert response.data == {'nodes': [], 'edges': []}
+
+
+@pytest.mark.django_db
+def test_graph_with_data(api_client, sample_contact, sample_relation):
+    response = api_client.get('/api/v1/graph/')
+    assert response.status_code == 200
+    assert len(response.data['nodes']) == 2
+    assert len(response.data['edges']) == 1
+
+
+@pytest.mark.django_db
+def test_legacy_api_path(api_client):
+    response = api_client.get('/api/graph/')
+    assert response.status_code == 200

backend/tests/test_meta_api.py

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+import pytest
+
+
+@pytest.mark.django_db
+def test_meta_choices(api_client):
+    response = api_client.get('/api/v1/meta/choices/')
+    assert response.status_code == 200
+    data = response.data
+    assert 'relation_types' in data
+    assert 'life_spheres' in data
+    assert 'network_circles' in data
+    assert 'interaction_intensities' in data
+    assert any(x['value'] == 'friend' for x in data['relation_types'])
+
+
+@pytest.mark.django_db
+def test_relation_types_legacy(api_client):
+    response = api_client.get('/api/v1/relation-types/')
+    assert response.status_code == 200
+    assert len(response.data) >= 1

backend/tests/test_plugins_api.py

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+import pytest
+
+
+@pytest.mark.django_db
+def test_plugin_manifest(api_client):
+    response = api_client.get('/api/v1/plugins/')
+    assert response.status_code == 200
+    ids = [p['id'] for p in response.data]
+    assert 'tags' in ids
+
+
+@pytest.mark.django_db
+def test_tags_crud(api_client, sample_contact):
+    create = api_client.post(
+        '/api/v1/plugins/tags/contact-tags/',
+        {'contact': sample_contact.id, 'label': 'коллеги'},
+        format='json',
+    )
+    assert create.status_code == 201
+    tag_id = create.data['id']
+
+    listing = api_client.get(f'/api/v1/plugins/tags/contact-tags/?contact_id={sample_contact.id}')
+    assert listing.status_code == 200
+    assert listing.data['count'] == 1
+
+    delete = api_client.delete(f'/api/v1/plugins/tags/contact-tags/{tag_id}/')
+    assert delete.status_code == 204