claude fix: improve product scraping and debugging features

backend/app/scraper/runner.py

@@ -244,6 +244,55 @@ def scrape_product(product_id: int) -> None:
         session.close()
 
 
+def scrape_preview(url: str) -> dict:
+    """
+    Scrape une URL Amazon sans enregistrer en base.
+    Retourne les données extraites pour prévisualisation.
+    """
+    logger.info("Prévisualisation scrape pour URL: {}", url)
+    config = load_config()
+
+    result = {
+        "url": url,
+        "success": False,
+        "data": {},
+        "error": None,
+    }
+
+    try:
+        with sync_playwright() as playwright:
+            browser, context = _create_browser_context(playwright, config)
+            page = context.new_page()
+            page.set_default_timeout(config.scrape.timeout_ms)
+
+            try:
+                page.goto(url, wait_until="domcontentloaded", timeout=config.scrape.timeout_ms)
+
+                # Extraire les données
+                data = extract_product_data(page, url)
+
+                # Vérifier si bloqué
+                if not data.get("titre"):
+                    result["error"] = "Blocage Amazon détecté ou produit introuvable"
+                    result["data"] = data
+                else:
+                    result["success"] = True
+                    result["data"] = data
+
+                # Sauvegarder la session
+                _save_storage_state(context)
+
+            finally:
+                context.close()
+                browser.close()
+
+    except Exception as e:
+        logger.exception("Erreur prévisualisation scrape: {}", e)
+        result["error"] = str(e)
+
+    return result
+
+
 def scrape_all(product_ids: Iterable[int] | None = None) -> None:
     logger.info("Déclenchement du scraping global")
     session = database.SessionLocal()