feat(api): implement product creation and category update endpoints

frontend/app/kvitto/ReceiptImportClient.tsx

@@ -1,7 +1,6 @@
 'use client';
 
 import { useRef, useState, useEffect } from 'react';
-import { createProductAction, updateProductCategoryAction } from './actions';
 
 type CategorySuggestion = {
   categoryId: number;
@@ -194,15 +193,34 @@ export default function ReceiptImportClient({ isAdmin }: { isAdmin: boolean }) {
     setCreatingProduct(i);
     setError(null);
     // eslint-disable-next-line no-console
-    console.log('handleCreateProduct: isAdmin =', isAdmin, 'endpoint = /api/products');
+    console.log('handleCreateProduct: isAdmin =', isAdmin, 'endpoint = /api/products-create');
     try {
-      // Admin skapar aktiv produkt direkt via Server Action
-      const product = await createProductAction(row.rawName);
+      // Admin skapar aktiv produkt via API route
+      const res = await fetch('/api/products-create', {
+        method: 'POST',
+        headers: { 'Content-Type': 'application/json' },
+        body: JSON.stringify({ name: row.rawName }),
+      });
+
+      if (!res.ok) {
+        const e = await res.json().catch(() => ({}));
+        throw new Error(e.error ?? `HTTP ${res.status}`);
+      }
+
+      const product = await res.json();
 
       // Sätt kategori: AI-förslag har prioritet, annars manuellt val
       const categoryId = row.categorySuggestion?.categoryId ?? (row.selectedCategoryId !== '' ? row.selectedCategoryId : null);
       if (categoryId) {
-        await updateProductCategoryAction(product.id, categoryId);
+        const patchRes = await fetch(`/api/products-update/${product.id}`, {
+          method: 'PATCH',
+          headers: { 'Content-Type': 'application/json' },
+          body: JSON.stringify({ categoryId }),
+        });
+        if (!patchRes.ok) {
+          const e = await patchRes.json().catch(() => ({}));
+          throw new Error(e.error ?? `HTTP ${patchRes.status}`);
+        }
       }
 
       // Uppdatera produktlistan lokalt