feat(chat): add dynamic provider catalog and zen support

backend/server/chat/urls.py

@@ -1,10 +1,13 @@
 from django.urls import include, path
 from rest_framework.routers import DefaultRouter
 
-from .views import ChatViewSet
+from .views import ChatProviderCatalogViewSet, ChatViewSet
 
 router = DefaultRouter()
 router.register(r"conversations", ChatViewSet, basename="chat-conversation")
+router.register(
+    r"providers", ChatProviderCatalogViewSet, basename="chat-provider-catalog"
+)
 
 urlpatterns = [
     path("", include(router.urls)),