Custom skins for donors and project contributors

As a way of showing our appreciation for the generous support of our donors, we would like to offer them the option to upload custom skins for their in-game player. These skins would be purely cosmetic and would not provide any gameplay advantages.

Donors who choose to upload a custom skin would have the ability to personalize their in-game experience and stand out among other players. This feature would be available only to donors and would serve as a token of our appreciation for their support.

We believe that offering this option for donors would add value to our server and create a more engaging experience for our players. We would like to hear your thoughts on this idea and if there are any concerns that we should address.

The issue describes a donor-only cosmetic custom-skin feature for the Lua game mode, but names no files, tests, entry points, upload mechanism, or skin constraints. First inspect the repository structure and existing player, donor, and asset-handling code. Done requires an agreed design and a defined implementation and validation path, which the issue does not yet provide.

Written by the indexing model from the issue text.