Add supplier and imporve inventory frontend

shared/messaging/rabbitmq.py

@@ -23,6 +23,9 @@ def json_serializer(obj):
         return obj.isoformat()
     elif isinstance(obj, uuid.UUID):
         return str(obj)
+    elif hasattr(obj, '__class__') and obj.__class__.__name__ == 'Decimal':
+        # Handle Decimal objects from SQLAlchemy without importing decimal
+        return float(obj)
     raise TypeError(f"Object of type {type(obj)} is not JSON serializable")
 
 class RabbitMQClient: