Fix username not passed to script deployment

- Include username and port in scan_complete WebSocket event
- Pass username from scan data when deploying scripts

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

backend/app.py

@@ -109,6 +109,8 @@ def start_scan():
         socketio.emit("scan_complete", {
             "scan_id": result.scan_id,
             "hostname": hostname,
+            "username": result.username,
+            "port": result.port,
             "connected": result.connected,
             "error": result.error,
         })