feat: add functionality to manually add ingredients; implement CreateIngredientDto and update RecipesController and RecipesService

backend/src/recipes/recipes.service.ts

@@ -4,6 +4,7 @@ import * as fs from 'node:fs/promises';
 import * as path from 'node:path';
 import { PrismaService } from '../prisma/prisma.service';
 import { CreateRecipeDto } from './dto/create-recipe.dto';
+import { CreateIngredientDto } from './dto/create-ingredient.dto';
 import { ParseMarkdownDto } from './dto/parse-markdown.dto';
 import { downloadAndOptimizeImage } from '../common/utils/download-image';
 import { parseRecipeMarkdown, ParsedRecipe, ParsedIngredient } from '../common/utils/recipe-parser';
@@ -475,6 +476,25 @@ export class RecipesService {
     }
   }
 
+  async addIngredient(id: number, ingredient: CreateIngredientDto, userId: number) {
+    const recipe = await this.findRecipeByIdOrThrow(id);
+    await this.assertRecipeOwnedByUser(recipe, userId, id);
+    await this.assertProductsActive([ingredient.productId]);
+
+    return this.prisma.recipeIngredient.create({
+      data: {
+        productId: ingredient.productId,
+        quantity: ingredient.quantity,
+        unit: ingredient.unit,
+        note: ingredient.note || null,
+        recipeId: id,
+      },
+      include: {
+        product: { include: { nutrition: true } },
+      },
+    });
+  }
+
   async parseMarkdown(dto: ParseMarkdownDto) {
     // Delegera markdown-parsning till microservice-importer
     const importerUrl = process.env.IMPORTER_SERVICE_URL || 'http://importer-api:3001';