Activation API Response Should Include Pagination Details

Retrieving Activations using the API, the maximum number of activations returned is 200.

The response object does not include `result_size` and `current_index` elements which would allow me to page through the result set to retrieve all activations.

Could we add the parameters in the response body or as HTTP response headers to help with this?

No files or tests are named. Start by locating the activation retrieval API entry point and its existing pagination handling, then inspect how response metadata is represented. Done means clients can use result_size and current_index, either in the response body or HTTP headers, with coverage for paginated activation retrieval.

Written by the indexing model from the issue text.