Inconsistency when fetching addons

[MarcBresson]

There are a few inconsistencies when the addon manager (v2026.8.18 and bundled) fetches addons:

• a few of them don't have their icon fetched (the fact that missing icons are grouped may means something)

• An addon is sometimes displayed under it s key name (e.g. from https://github.com/FreeCAD/Addons/blob/main/Data/Index.json#L622-L630), and sometimes using the name defined in package.xml file. It seems random.

Both issues seem correlated: when my addon is displayed as CarteGrid, it has an icon; and when it is displayed as FreeCAD-Params-Export it does not have a logo.

This leads me to think it has an issue on the server side script that fetches metadata. I will investigate

For reference : MarcBresson/CarteGrid#32 and FreeCAD/Addons#140