def _os_info(self) -> str:
        """Get platform-specific OS info for user agent"""
        if platform.system() == "Windows":
            return "Windows NT 10.0; Win64; x64"
        elif platform.system() == "Darwin":
            return "Macintosh; Intel Mac OS X 10_15_7"
        else:
            return "X11; Linux x86_64"
Get platform-specific OS info for user agent
backend/Browser/webrover_browser.py