fix: Add bounding box to nutrition extraction

[abderhman487]

What

• Added bounding box computation for nutrition extraction using OCR word positions
• Added bounding_box column to both prediction and product_insight tables
• Included bounding box in nutrition extraction insights
• Created an endpoint to allow users to propose a new bounding box during validation
• Modified the image cropping function to use the stored bounding box information

Implementation Details

• Enhanced NutrientPrediction and NutritionExtractionPrediction classes to include bounding box information
• Added compute_bounding_box function to calculate the overall bounding box from individual word positions
• Updated the NutrientExtractionImporter to include bounding box data in generated insights
• Added support for updating bounding box through annotation in NutrientExtractionAnnotator

How This Improves User Experience

This enhancement significantly improves the visualization of nutrition extraction results during validation. Previously, the bounding box was only used internally for cropping, but was not exposed in the insight data. Now, users validating nutrition insights can see exactly which part of the image was analyzed, and even propose corrections to the bounding box if needed.

Fixes

Add bounding box to nutrition extraction #1539

[abderhman487]

@alexgarel

[alexgarel]

@abderhman487 so sorry, I only see this PR now, I will try to review it soon !

[abderhman487]

@alexgarel @raphael0202 Any updates?

[raphael0202]

Hello @abderhman487,
I'm sorry for the review delay. I will review your PR this week!