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/automation/serializers.py

@@ -0,0 +1,36 @@
+"""
+Serializers for Automation Models
+"""
+from rest_framework import serializers
+from igny8_core.business.automation.models import AutomationRule, ScheduledTask
+
+
+class AutomationRuleSerializer(serializers.ModelSerializer):
+    """Serializer for AutomationRule model"""
+    
+    class Meta:
+        model = AutomationRule
+        fields = [
+            'id', 'name', 'description', 'trigger', 'schedule',
+            'conditions', 'actions', 'is_active', 'status',
+            'last_executed_at', 'execution_count',
+            'metadata', 'created_at', 'updated_at',
+            'account', 'site', 'sector'
+        ]
+        read_only_fields = ['id', 'created_at', 'updated_at', 'last_executed_at', 'execution_count']
+
+
+class ScheduledTaskSerializer(serializers.ModelSerializer):
+    """Serializer for ScheduledTask model"""
+    automation_rule_name = serializers.CharField(source='automation_rule.name', read_only=True)
+    
+    class Meta:
+        model = ScheduledTask
+        fields = [
+            'id', 'automation_rule', 'automation_rule_name',
+            'scheduled_at', 'executed_at', 'status',
+            'result', 'error_message', 'metadata',
+            'created_at', 'updated_at', 'account'
+        ]
+        read_only_fields = ['id', 'created_at', 'updated_at', 'executed_at']
+