Admidio: IDOR in documents-files.php allows cross-folder file rename and description changes by unauthorized uploaders

Summary modules/documents-files.php mode filerenamesave shares the same root-cause shape as the cross-folder move bug 05-documents-cross-folder-move-idor.md: the top-level rights check at lines 79-89 validates hasUploadRight on the URL parameter folderuuid, but the rename operation acts on fileuu...