fix: skip additional servers prompt when AUTO_YES=1

The auto-yes flag was entering the add-servers loop and prompting for
input. Now breaks out of the loop immediately in non-interactive mode.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

install.sh

@@ -328,6 +328,7 @@ SERVERS_JSON="${CURRENT_SERVERS:-}"
 
 while true; do
   echo ""
+  if [ "$AUTO_YES" = "1" ]; then break; fi
   if ! ask_yes_no "Add an additional Gitea server?"; then
     break
   fi