feat(meal-plan): add servings field to MealPlanEntry and update related functionality

feat(products): implement bulk update for product categories

feat(recipes): add servings input to WriteRecipePage and update MealPlanClient for servings management

refactor(types): enhance Product and Category types with additional properties

backend/src/meal-plan/dto/create-meal-plan-entry.dto.ts

@@ -1,4 +1,4 @@
-import { IsDateString, IsInt, IsPositive } from 'class-validator';
+import { IsDateString, IsInt, IsOptional, IsPositive, Min } from 'class-validator';
 
 export class CreateMealPlanEntryDto {
   @IsDateString()
@@ -7,4 +7,9 @@ export class CreateMealPlanEntryDto {
   @IsInt()
   @IsPositive()
   recipeId: number;
+
+  @IsOptional()
+  @IsInt()
+  @Min(1)
+  servings?: number;
 }

backend/src/meal-plan/meal-plan.service.ts

@@ -6,6 +6,7 @@ const recipeSelect = {
   id: true,
   name: true,
   imageUrl: true,
+  servings: true,
   ingredients: {
     select: {
       quantity: true,
@@ -36,8 +37,8 @@ export class MealPlanService {
     const date = new Date(dto.date);
     return this.prisma.mealPlanEntry.upsert({
       where: { date },
-      create: { date, recipeId: dto.recipeId },
-      update: { recipeId: dto.recipeId },
+      create: { date, recipeId: dto.recipeId, servings: dto.servings ?? null },
+      update: { recipeId: dto.recipeId, servings: dto.servings ?? null },
       include: { recipe: { select: recipeSelect } },
     });
   }
@@ -55,13 +56,16 @@ export class MealPlanService {
   async shoppingList(from: string, to: string) {
     const entries = await this.findByRange(from, to);
 
-    // Summera ingredienser per produkt+enhet
+    // Summera ingredienser per produkt+enhet (skalat per portionsantal)
     const map = new Map<string, { productId: number; name: string; quantity: number; unit: string }>();
     for (const entry of entries) {
+      const recipeServings = (entry.recipe as any).servings as number | null;
+      const entryServings = (entry as any).servings as number | null;
+      const scale = recipeServings && entryServings ? entryServings / recipeServings : 1;
       for (const ing of entry.recipe.ingredients) {
         const key = `${ing.product.id}-${ing.unit}`;
         const existing = map.get(key);
-        const qty = Number(ing.quantity);
+        const qty = Number(ing.quantity) * scale;
         if (existing) {
           existing.quantity += qty;
         } else {
@@ -82,12 +86,15 @@ export class MealPlanService {
   async inventoryCompare(from: string, to: string) {
     const entries = await this.findByRange(from, to);
 
-    // Aggregera ingredienser per produkt+enhet
+    // Aggregera ingredienser per produkt+enhet (skalat per portionsantal)
     const map = new Map<string, { productId: number; name: string; required: number; unit: string }>();
     for (const entry of entries) {
+      const recipeServings = (entry.recipe as any).servings as number | null;
+      const entryServings = (entry as any).servings as number | null;
+      const scale = recipeServings && entryServings ? entryServings / recipeServings : 1;
       for (const ing of entry.recipe.ingredients) {
         const key = `${ing.product.id}-${ing.unit}`;
-        const qty = Number(ing.quantity);
+        const qty = Number(ing.quantity) * scale;
         const existing = map.get(key);
         if (existing) {
           existing.required += qty;