Title: Add Email and Phone Columns to the PrestaShop Order List

My store is running PrestaShop 1.6.1.6 and I need a small yet precise back-office tweak. In the Orders list I want two extra columns—customer email and customer account phone number—shown right beside the existing Order ID, customer name, total, etc. The data is already stored; it simply isn’t visible. What I expect • Full email address and full phone number displayed for every order. • The phone value must be pulled from the customer’s account record, not the billing or delivery address. • Staff must be able to search and sort the grid by these two new columns exactly as they do with the other fields. • The solution has to be upgrade-friendly: an override of AdminOrdersController, a template override, or a small module rather than a core edit so future patches won’t wipe the change. When you reply, please outline: – The approach you would use (e.g., controller override, module, hook, Smarty template). – Any previous experience you have specifically with PrestaShop 1.6.x customisations. – An estimated cost and timeline to deliver and test the change. Clean, maintainable code and a brief note of what you modified will be the final deliverable.