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/core/__init__.py

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+

backend/core/apps.py

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+from django.apps import AppConfig
+
+
+class CoreConfig(AppConfig):
+    default_auto_field = 'django.db.models.BigAutoField'
+    name = 'core'

backend/core/auth_urls.py

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+from django.urls import path
+
+urlpatterns = []
+
+try:
+    from django.conf import settings
+    if getattr(settings, 'USE_JWT_AUTH', False):
+        from rest_framework_simplejwt.views import TokenObtainPairView, TokenRefreshView
+
+        urlpatterns = [
+            path('auth/token/', TokenObtainPairView.as_view(), name='token_obtain_pair'),
+            path('auth/token/refresh/', TokenRefreshView.as_view(), name='token_refresh'),
+        ]
+except ImportError:
+    pass

backend/core/choices.py

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+"""Shared domain choice constants for API meta and models."""
+
+LIFE_SPHERES = [
+    ('work', 'Работа'),
+    ('study', 'Учёба'),
+    ('hobby', 'Хобби'),
+    ('family', 'Семья'),
+    ('health', 'Здоровье'),
+    ('other', 'Другое'),
+]
+
+NETWORK_CIRCLES = [
+    ('support', 'Круг поддержки'),
+    ('productivity', 'Круг продуктивности'),
+    ('development', 'Круг развития'),
+]
+
+INTERACTION_INTENSITY = [
+    ('intense', 'Интенсивные контакты'),
+    ('periodic', 'Периодические контакты'),
+    ('sparse', 'Редкие контакты'),
+]
+
+RELATION_TYPES = [
+    ('colleague', 'Коллега'),
+    ('friend', 'Друг'),
+    ('family', 'Родственник'),
+    ('acquaintance', 'Знакомый'),
+    ('business', 'Деловой партнёр'),
+    ('other', 'Другое'),
+]
+
+
+def choices_payload():
+    return {
+        'relation_types': [{'value': v, 'label': l} for v, l in RELATION_TYPES],
+        'life_spheres': [{'value': v, 'label': l} for v, l in LIFE_SPHERES],
+        'network_circles': [{'value': v, 'label': l} for v, l in NETWORK_CIRCLES],
+        'interaction_intensities': [{'value': v, 'label': l} for v, l in INTERACTION_INTENSITY],
+    }

backend/core/urls.py

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+from django.urls import path
+
+from . import views
+
+urlpatterns = [
+    path('meta/choices/', views.meta_choices, name='meta-choices'),
+    path('relation-types/', views.relation_types, name='relation-types'),
+    path('network-map-choices/', views.network_map_choices, name='network-map-choices'),
+]

backend/core/views.py

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+from rest_framework.decorators import api_view
+from rest_framework.response import Response
+
+from .choices import (
+    RELATION_TYPES,
+    LIFE_SPHERES,
+    NETWORK_CIRCLES,
+    INTERACTION_INTENSITY,
+    choices_payload,
+)
+
+
+@api_view(['GET'])
+def meta_choices(request):
+    """Unified meta endpoint for all domain enums."""
+    return Response(choices_payload())
+
+
+@api_view(['GET'])
+def relation_types(request):
+    return Response([{'value': v, 'label': l} for v, l in RELATION_TYPES])
+
+
+@api_view(['GET'])
+def network_map_choices(request):
+    return Response({
+        'life_spheres': [{'value': v, 'label': l} for v, l in LIFE_SPHERES],
+        'network_circles': [{'value': v, 'label': l} for v, l in NETWORK_CIRCLES],
+        'interaction_intensities': [{'value': v, 'label': l} for v, l in INTERACTION_INTENSITY],
+    })