feat: add AirShelf core implementation

core/backend/apps/ai/urls.py

@@ -0,0 +1,9 @@
+from rest_framework.routers import DefaultRouter
+
+from .views import AITaskViewSet, ModelConfigViewSet
+
+router = DefaultRouter()
+router.register("tasks", AITaskViewSet, basename="ai-task")
+router.register("models", ModelConfigViewSet, basename="model-config")
+
+urlpatterns = router.urls