Add frontend debug logging for cookies

src/components/DownloadForm.astro

@@ -133,6 +133,14 @@ const streamOnly = process.env.STREAM_ONLY === "true";
 
     if (!url || !downloadBtn || !status || !loading) return;
 
+    // Debug: Prüfe ob Cookies vorhanden sind
+    if (cookies) {
+      console.log(`Cookies gefunden: ${cookies.length} Zeichen`);
+      console.log(`Erste Zeile: ${cookies.split('\n')[0]}`);
+    } else {
+      console.log("Keine Cookies im Request");
+    }
+
     (downloadBtn as HTMLButtonElement).disabled = true;
     status.classList.add("hidden");
     loading?.classList.remove("hidden");