analyze_recipe seems to multiply nutrients incorrectly

[kevinsu628]

Hi, thanks for this amazing open source project!

I think I've discovered a bug in the analyze_recipe method.

ef analyze_recipe(
    recipe: Recipe,
    dri_type: DriType = DriType.RDA,
    gender: Gender = Gender.MALE,
    age: int = 30
) -> RecipeAnalysis:
    """
    Analyze the nutrient content of a recipe.
    
    Args:
        recipe: The recipe to analyze.
        dri_type: The type of DRI to use for comparison.
        gender: The gender to use for DRI values.
        age: The age to use for DRI values.
        
    Returns:
        A RecipeAnalysis object.
    """
    ...
    
    # Combine nutrients from all ingredients
    nutrient_map: Dict[int, Nutrient] = {}
    
    for analysis in ingredient_analyses:
        for nutrient in analysis.food.nutrients:
            if nutrient.id in nutrient_map:
                # Add to existing nutrient
                existing = nutrient_map[nutrient.id]
                existing.amount += nutrient.amount * (analysis.serving_size / 100.0)
            else:
                # Create new nutrient
                new_nutrient = Nutrient(
                    id=nutrient.id,
                    name=nutrient.name,
                    amount=nutrient.amount * (analysis.serving_size / 100.0),
                    unit_name=nutrient.unit_name,
                    nutrient_nbr=nutrient.nutrient_nbr,
                    rank=nutrient.rank
                )
                nutrient_map[nutrient.id] = new_nutrient
                combined_food.nutrients.append(new_nutrient)
    
    # Analyze the combined food per serving
    per_serving_analysis = analyze_food(
        combined_food,
        serving_size=recipe.get_weight_per_serving(),
        dri_type=dri_type,
        gender=gender,
        age=age
    )
    
    return RecipeAnalysis(
        recipe=recipe,
        per_serving_analysis=per_serving_analysis,
        ingredient_analyses=ingredient_analyses
    )

while calculating each nutrient, we already multiply the nutrient amount by the serving size factor: amount=nutrient.amount * (analysis.serving_size / 100.0),

but while calculating per_serving_analysis, we are multiply by the recipe.get_weight_per_serving() again by the analyze_food function.

For example, if I have this recipe with only 1 ingredient:

'1 cup oatmeal'

the converted gram is 240g, the food entry taken is the 1st match , then the factor is 240g/100g = 2.4.
This 1995469 oatmeal has 1580 kcal per 100g, so 1580 x 2.4 = 3,792 kcal for 1 serving.
But 3,792 kcal is multiplied by recipe.get_weight_per_serving() again, which gives me calories_per_serving = 9089.279999999999

This doesn't seem correct to me.

Hope to get any response. Thanks!