BUG: Change Trame.json to SlicerTrame.json (#2193)

Renames the extension catalog entry file from `Trame.json` to `SlicerTrame.json`
for consistency with the extension's advertised purpose and name. This avoids
confusion with the broader Trame project.

This aligns the file name with the actual extension name and
prevents ambiguity with the upstream `trame` framework.

Author: jcfr