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/celery.py

@@ -25,6 +25,10 @@ app.conf.beat_schedule = {
         'task': 'igny8_core.modules.billing.tasks.replenish_monthly_credits',
         'schedule': crontab(hour=0, minute=0, day_of_month=1),  # First day of month at midnight
     },
+    'execute-scheduled-automation-rules': {
+        'task': 'igny8_core.business.automation.tasks.execute_scheduled_automation_rules',
+        'schedule': crontab(minute='*/5'),  # Every 5 minutes
+    },
 }
 
 @app.task(bind=True, ignore_result=True)