feat: send X-Prerender-Int-Version and X-Prerender-Request-Id

Lets the backend correlate requests with a specific integration version
and uniquely identify each request for support triage.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

Author: Marcin

src/main/java/io/prerender/PrerenderFilter.java

@@ -14,11 +14,14 @@
 import java.net.http.HttpClient;
 import java.net.http.HttpRequest;
 import java.net.http.HttpResponse;
+import java.util.UUID;
 import java.util.logging.Level;
 import java.util.logging.Logger;
 
 public class PrerenderFilter implements Filter {
 
+    public static final String VERSION = "1.0.0";
+
     private static final Logger logger = Logger.getLogger(PrerenderFilter.class.getName());
 
     private HttpClient httpClient;
@@ -101,6 +104,8 @@ private HttpRequest buildPrerenderRequest(String apiUrl, String userAgent) {
             builder.header("X-Prerender-Token", config.getToken());
         }
         builder.header("X-Prerender-Int-Type", "Java");
+        builder.header("X-Prerender-Int-Version", VERSION);
+        builder.header("X-Prerender-Request-Id", UUID.randomUUID().toString());
         return builder.build();
     }
 }