Add print statement 'hello world' in backend/app.py

[sweep-ai[bot]]

Description

This PR adds a print statement 'hello world' under the main method in the backend/app.py file. The print statement is added to provide a simple greeting message whenever the script is run directly.

Summary of Changes

• Created a new branch sweep-dummy from the latest next-js branch.
• Added a print statement 'hello world' under the main method in the backend/app.py file.

Please review and merge these changes at your earliest convenience.

Fixes #891.

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[farisdurrani]

I understand the print statement is unnecessary but can you please add it anyways?