feat: add dataset item images

backend/internal/logic/dataset/handlers_test.go

@@ -51,12 +51,13 @@ func TestDatasetAPIConnectsSourcesItemsAndSyncTasks(t *testing.T) {
 
 	createdItem := performDatasetRequest(t, ownerRouter, http.MethodPost, "/api/v1/dataset-items", map[string]any{
 		"sourceId": source.ID, "title": "A collected article", "summary": "Summary",
-		"url": "https://example.com/article",
+		"url": "https://example.com/article", "imageUrl": "https://example.com/article.jpg",
 	})
 	require.Equal(t, http.StatusCreated, createdItem.Code)
 	var item ItemDTO
 	require.NoError(t, json.Unmarshal(createdItem.Body.Bytes(), &item))
 	require.Equal(t, source.ID, item.SourceID)
+	require.Equal(t, "https://example.com/article.jpg", item.ImageURL)
 	legacyItems := performDatasetRequest(t, ownerRouter, http.MethodGet, "/api/v1/dataset-items", nil)
 	require.Equal(t, http.StatusOK, legacyItems.Code)
 	var legacyItemList []ItemDTO
@@ -269,6 +270,7 @@ func (staticFeedFetcher) Fetch(context.Context, string) (ParsedFeed, error) {
 			Summary:    "Collected summary",
 			Content:    "Collected content",
 			URL:        "https://example.com/collected",
+			ImageURL:   "https://example.com/collected.jpg",
 		}},
 	}, nil
 }