chore: update @ngrx/signals to version 18.1.1

Adds @ngrx/signals version 18.1.1 to package.json and 
package-lock.json to incorporate new features and 
improvements. This update ensures compatibility with 
Angular 18 and enhances the overall performance of 
the application.

package.json

@@ -43,6 +43,7 @@
         "@ngrx/effects": "18.0.2",
         "@ngrx/entity": "18.0.2",
         "@ngrx/router-store": "18.0.2",
+        "@ngrx/signals": "18.1.1",
         "@ngrx/store": "18.0.2",
         "@ngrx/store-devtools": "18.0.2",
         "@ngx-pwa/local-storage": "18.0.0",