Refactor redundant SDG score rounding in aurora_api.py

[Tech-Psycho95]

Description

This PR addresses the issue of inefficient SDG score rounding in backend/aurora_api.py. The current implementation uses a verbose and redundant method to round scores to three decimal places, which has been refactored to use Python's built-in round() function for improved code quality.

Changes Made

• File Modified: backend/aurora_api.py (around line 75)
• Before: sdg_predictions[sdg_name] = float(f"{float(score):.3f}")
• After: sdg_predictions[sdg_name] = round(score, 3)

Why This Change?

The original code was unnecessarily complex and inefficient. By switching to round(score, 3), it achieved:

• Better Readability: The intent is immediately clear without string formatting gymnastics.
• Improved Efficiency: Built-in functions are optimized and faster than converting floats to strings and back.
• Enhanced Maintainability: Simpler, more idiomatic Python code that's easier to understand and modify.

Testing

• Verified that the rounding behavior remains identical (e.g., round(0.123456, 3) produces 0.123).
• No functional changes to the API output; scores are still rounded to 3 decimal places.
• Ran existing tests (if any) to ensure no regressions.

Closes #41

Checklist

• Code follows project style guidelines
• No breaking changes
• Tested locally
• Documentation updated (if needed)