Fix Nginx 502 Bad Gateway with Docker Socket - How to Solve 'No such file or directory' When Activating Python venv-Resolve Nginx 502 with Docker and PHP-FPM

Extra verification checklist

• Restart the affected app after changing permissions or configuration files.
• Test the same workflow in a clean browser profile or a temporary user account.
• Compare the result on another network if the error may be connection related.