fix: KöPi - Scrollen für lazy-loaded Bilder

backend/src/tools/koepi/routes.js

@@ -64,13 +64,22 @@ async function scrapeMarktguru() {
     await page.goto('https://www.marktguru.de/search/k%C3%B6nig%20pilsener?zipCode=47259', {
       waitUntil: 'networkidle2', timeout: 30000,
     });
-    // Warte bis alle Bilder geladen sind
-    await page.evaluate(() => Promise.all(
-      Array.from(document.querySelectorAll('img.offer-list-item-img')).map(img =>
-        img.complete ? Promise.resolve() : new Promise(r => { img.onload=r; img.onerror=r; setTimeout(r,5000); })
-      )
-    )).catch(() => {});
-    await new Promise(r => setTimeout(r, 2000));
+    // Seite nach unten scrollen damit lazy-loaded Bilder geladen werden
+    await page.evaluate(async () => {
+      await new Promise(resolve => {
+        let totalHeight = 0;
+        const distance = 300;
+        const timer = setInterval(() => {
+          window.scrollBy(0, distance);
+          totalHeight += distance;
+          if (totalHeight >= document.body.scrollHeight) {
+            clearInterval(timer);
+            resolve();
+          }
+        }, 200);
+      });
+    });
+    await new Promise(r => setTimeout(r, 3000));
 
     const offers = await page.evaluate(() => {
       // Exakte Selektoren basierend auf marktguru HTML-Struktur