fix: SessionRecorder usage

Author: DmytryS

src/main/java/app/multiplayer/session_recorder/type/Session.java

@@ -2,6 +2,7 @@
 
 import java.util.List;
 import java.util.Map;
+import java.util.ArrayList;
 
 public class Session {
     private String id;
@@ -11,7 +12,7 @@ public class Session {
     private Map<String, Object> resourceAttributes;
     private Map<String, Object> sessionAttributes;
 
-    private List<Tag> tags;
+    private List<Tag> tags = new ArrayList<>();
 
     // --- Getters and Setters ---