Enatega (Admin+Customer+Restaurant) : Reason for Order Cancellations feature

A clear and concise description of what you want to happen.

When the customer rejects the order, a pop-up should open and allow customer to write the reason for order cancellation OR display some common reasons of order cancellation from which user can select accordingly.

No files, tests, or entry points are named. Start by tracing the customer order-rejection flow and the corresponding Admin and Restaurant order views. Before implementation, clarify whether cancellation reasons should be free text, selectable common reasons, or both; done means the chosen behavior works across the mentioned order-management surfaces.

Written by the indexing model from the issue text.