nutrition: detect recipe refs in ingredients, show in edit UI with multiplier

Skip embedding matching for anchor-tag ingredients that reference other
recipes. Instead, mark them with recipeRef/recipeRefMultiplier fields so
their nutrition is resolved via resolveReferencedNutrition with a
user-configurable fraction. The edit UI shows these as teal REF badges
with an editable "Anteil" input.

src/routes/api/[recipeLang=recipeLang]/items/[name]/+server.ts

@@ -157,7 +157,7 @@ export const GET: RequestHandler = async ({ params }) => {
     }
 
     // Resolve nutrition from referenced recipes (base refs + anchor tags)
-    recipe.referencedNutrition = await resolveReferencedNutrition(rawRecipe.ingredients || []);
+    recipe.referencedNutrition = await resolveReferencedNutrition(rawRecipe.ingredients || [], rawRecipe.nutritionMappings);
 
     // Merge English alt/caption with original image paths
     const imagesArray = Array.isArray(rawRecipe.images) ? rawRecipe.images : (rawRecipe.images ? [rawRecipe.images] : []);
@@ -184,6 +184,6 @@ export const GET: RequestHandler = async ({ params }) => {
     recipe.instructions = mapBaseRecipeRefs(recipe.instructions);
   }
   // Resolve nutrition from referenced recipes (base refs + anchor tags)
-  recipe.referencedNutrition = await resolveReferencedNutrition(rawRecipe.ingredients || []);
+  recipe.referencedNutrition = await resolveReferencedNutrition(rawRecipe.ingredients || [], rawRecipe.nutritionMappings);
   return json(recipe);
 };

src/routes/api/[recipeLang=recipeLang]/json-ld/[name]/+server.ts

@@ -17,7 +17,7 @@ export const GET: RequestHandler = async ({ params, setHeaders }) => {
     throw error(404, "Recipe not found");
   }
 
-  const referencedNutrition = await resolveReferencedNutrition(recipe.ingredients || []);
+  const referencedNutrition = await resolveReferencedNutrition(recipe.ingredients || [], recipe.nutritionMappings);
   const jsonLd = generateRecipeJsonLd(recipe, referencedNutrition);
 
   // Set appropriate headers for JSON-LD