Fix: install ffmpeg, rsync, sox and add fallback copy in BackupManager for sound extraction

scripts/fix.sh

@@ -16,8 +16,8 @@ cd /var/www/nexus-pbx
 git fetch origin main
 git reset --hard origin/main
 
-echo "-> Installation des outils de droits (ACL)..."
-which setfacl >/dev/null 2>&1 || (apt-get update -y && apt-get install -y acl)
+echo "-> Installation des dépendances système indispensables (ACL, ffmpeg, rsync, sox)..."
+which ffmpeg >/dev/null 2>&1 && which rsync >/dev/null 2>&1 && which setfacl >/dev/null 2>&1 || (apt-get update -y && apt-get install -y --no-install-recommends acl ffmpeg rsync sox)
 
 echo "-> Création des dossiers et des fichiers de journalisation..."
 mkdir -p /etc/fail2ban/filter.d /etc/asterisk /var/log/asterisk /var/log/nexus-pbx /var/www/nexus-pbx/storage/backups