Fix n8n 404 Error & Setup Gmail Auth

I'm facing a '404 Not Found' error on my self-hosted n8n instance hosted on a Hostinger VPS. I need an expert to fix the server issue by checking Nginx and Docker-compose. You will also need to authenticate the Gmail node using a 16-digit App Password and install Python 3 and PIP inside the n8n Docker container for script execution.

Ensure that the Postgres database is correctly linked and persistent. I have the necessary credentials ready to share (SSH/Root, Postgres, and Gmail App Passwords).

This task is urgent as I'm launching my first automated video tonight, so I need someone who can start immediately and finish in 1–2 hours.