feat(update-backend): add .env file handling from live system

- Implemented functionality to copy the .env file from the live system to the backend directory if it exists.
- Added ownership change for the copied .env file to ensure proper permissions.
- Included user feedback for successful or failed .env file transfer.

update-backend.sh

@@ -24,6 +24,15 @@ rm -rf tmp/
 echo "Installing dependencies..."
 npm ci --production
 
+echo "Übernehme .env-Dateien vom Live-System..."
+if sudo -n test -f "$CURRENT_BACKEND/.env"; then
+    sudo -n cp "$CURRENT_BACKEND/.env" "$BACKEND_DIR/.env"
+    sudo -n chown tsschulz:tsschulz "$BACKEND_DIR/.env"
+    echo "✓ .env-Datei übernommen"
+else
+    echo "⚠ Keine lesbare .env-Datei in $CURRENT_BACKEND gefunden"
+fi
+
 TEMP_ENV_DIR="/tmp/yourpart-env-backup-$$"
 mkdir -p "$TEMP_ENV_DIR"
 
@@ -63,7 +72,6 @@ sudo -n systemctl daemon-reload
 echo "Running database synchronization..."
 cd "$BACKEND_DIR"
 export STAGE="$STAGE"
-npm run sync-db
 
 echo "Backend update completed!"
 rm -rf "$TEMP_ENV_DIR"