feat: add scrape_async to ZenRowsScraper for async proxy fetches

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

src/vl_apify_shared/zenrows.py

@@ -55,3 +55,22 @@ class ZenRowsScraper:
             f"ZenRows scraped url: {url}. Returned status: {response.status_code} in {elapsed_time}ms"
         )
         return response
+
+    async def scrape_async(self, url: str, premium_proxy: bool = False):
+        """Fetch a URL asynchronously through ZenRows as a plain proxy (no JS rendering).
+
+        Args
+            url: URL to fetch
+            premium_proxy: use residential proxy (ZenRows premium_proxy=true)
+        """
+        self.logger.debug(f"ZenRows fetching url: {url}...")
+        params: dict = {}
+        if premium_proxy:
+            params["premium_proxy"] = "true"
+        start = time.monotonic()
+        response = await self.client.get_async(url, params=params)
+        elapsed_time = round((time.monotonic() - start) * 1000)
+        self.logger.debug(
+            f"ZenRows fetched url: {url}. Returned status: {response.status_code} in {elapsed_time}ms"
+        )
+        return response