feat: Implement actual pagination logic for array data

[AlAfiz]

Description

We previously added the ability to read page and limit query parameters. Now we need to actually slice the data array based on those parameters before sending it to the client.

Requirements

• Update the endpoint that returns a list (e.g., token list or transaction history).
• Calculate the startIndex and endIndex based on the requested page and limit.
• Use the JavaScript .slice() method to return only the requested chunk of the array.
• Include a totalCount in the JSON response so the frontend knows how many pages exist.