[Python] How to serve Flask app with Gunicorn and Nginx to display real-time logs?

I'm building a Flask-based logging server on Kali Linux, and I'm trying to:

Run the Flask app using Gunicorn.

Serve it through Nginx as a reverse proxy.

Manage it using systemd so it runs in the background and restarts if it fails.

Display real-time logs (submitted by a script via POST) in /var/www/html/index.html using a web page.

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