Enatega Admin Dashboard: When adding a Coupon, Discount field is allowing to enter more than 100%

Describe the bug
When adding a coupon, the Discount field allows users to enter a value greater than 100%, which is invalid. This could lead to incorrect calculations and potential financial losses or Also display an error message that discount percentage should not exceed 100%.

To Reproduce
Steps to reproduce the behavior:

Navigate to the Coupon Management section.
Click on Add New Coupon.
Enter a discount value greater than 100% (e.g., 150%).
Save the coupon, it will not save it so it should display an error message or restrict it to not enter amount greater than 100%.

Expected behavior
The system should restrict the Discount field to a maximum of 100% and display a validation error if a higher value is entered.

Desktop (please complete the following information):

OS: [e.g. Windows]
Browser [e.g. Chrome]
Version [e.g. Latest]

Start in the Admin Dashboard's Coupon Management flow, specifically the Add New Coupon form and its Discount field. Reproduce the issue by entering a value above 100% and saving; done means values over 100% are restricted or rejected with a clear validation error.

Written by the indexing model from the issue text.