Agent Integration credit counter per customer.

An application should be able to track and display the number of agent integration credits consumed by each prompt. For example, if a web app that we create with amembership plan may provide a user with 100 credits for $50, the system needs to show exactly how many credits were used whenever an agent runs a prompt.

Currently, Base44 does not provide a way to surface this logic directly to the client. I have to log into my Base44 account to see that some prompts use three credits, others two, and sometimes more. This usage detail should be visible to our customers so their credit balance reflects the same numbers we see on the backend.