Add verifyUser to AuthenticationHandler

src/main/java/emu/grasscutter/server/dispatch/authentication/DefaultAuthenticationHandler.java

@@ -28,6 +28,12 @@ public class DefaultAuthenticationHandler implements AuthenticationHandler {
         res.send("Authentication is not available with the default authentication method");
     }
 
+    @Override
+    public boolean verifyUser(String details) {
+        Grasscutter.getLogger().info(translate("dispatch.authentication.default_unable_to_verify"));
+        return false;
+    }
+
     @Override
     public LoginResultJson handleGameLogin(Request req, LoginAccountRequestJson requestData) {
         LoginResultJson responseData = new LoginResultJson();