Add scheduled automation task and update URL routing

- Introduced a new scheduled task for executing automation rules every 5 minutes in the Celery beat schedule.
- Updated URL routing to include a new endpoint for automation-related functionalities.
- Refactored imports in various modules to align with the new business layer structure, ensuring backward compatibility for billing models, exceptions, and services.

backend/igny8_core/modules/writer/serializers.py

@@ -1,7 +1,7 @@
 from rest_framework import serializers
 from django.db import models
 from .models import Tasks, Images, Content
-from igny8_core.modules.planner.models import Clusters, ContentIdeas
+from igny8_core.business.planning.models import Clusters, ContentIdeas
 
 
 class TasksSerializer(serializers.ModelSerializer):