fix: correct _allowed_origins typo to allowed_cors_origins in CORS middleware (closes #2083)

[namann5]

Description

Fixes a critical NameError at server startup that crashes the entire API.

The Bug

backend/main.py:1600 defines allowed_cors_origins = get_allowed_origins() but backend/main.py:1605 references _allowed_origins (note the underscore prefix), which was never defined.

When the server starts, FastAPI evaluates the CORS middleware configuration and throws:

NameError: name '_allowed_origins' is not defined

This crashes the server before any endpoint can respond.

Fix

One character fix: _allowed_origins → allowed_cors_origins on line 1605.

Closes #2083

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[riteshbonthalakoti]

Superb implementation, @namann5! I've successfully resolved all conflicts in your PR and queued it for merging into gssoc.

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