fix(logout): improve REST logout success handler and update gitignore

.gitignore

@@ -9,6 +9,7 @@
 .settings
 .springBeans
 .sts4-cache
+.DS_Store
 
 ### IntelliJ IDEA ###
 .idea

src/main/java/com/keymobile/sso/conf/RESTLogoutSuccessHandler.java

 package com.keymobile.sso.conf;
 
+import com.keymobile.sso.logging.LogConstants;
+import com.keymobile.sso.logging.LogManager;
 import jakarta.servlet.ServletException;
 import jakarta.servlet.http.HttpServletRequest;
 import jakarta.servlet.http.HttpServletResponse;
@@ -16,6 +18,10 @@ public class RESTLogoutSuccessHandler implements LogoutSuccessHandler {
 
     @Override
     public void onLogoutSuccess(HttpServletRequest request, HttpServletResponse response, Authentication authentication) throws IOException, ServletException {
+        if (authentication != null && authentication.getName() != null) {
+            LogManager.logInfo(LogConstants.CTX_AUDIT, "User logged out: " + authentication.getName());
+        }
+        request.getSession().invalidate();
         response.setStatus(HttpStatus.OK.value());
         response.getWriter().flush();
     }