feat: German translations for TheMealDB recipes + recipe detail view

- Add GermanTranslator service with 200+ ingredient and meal name mappings
- Translate titles and ingredients when fetching from TheMealDB
- Add click-to-view recipe detail modal on week plan meal cards
- Import RecipeDetail component in WeekPlanView

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

backend/Services/TheMealDbClient.cs

@@ -95,6 +95,7 @@ public class TheMealDbClient(HttpClient httpClient)
             recipe.Ingredients.Add(ingredient);
         }
 
+        GermanTranslator.TranslateRecipe(recipe);
         return recipe;
     }