fix(build): import lombok.Data manquant dans MessagingBean

src/main/java/dev/lions/unionflow/client/view/MessagingBean.java

@@ -13,6 +13,7 @@ import jakarta.faces.application.FacesMessage;
 import jakarta.faces.context.FacesContext;
 import jakarta.inject.Inject;
 import jakarta.inject.Named;
+import lombok.Data;
 import lombok.EqualsAndHashCode;
 import lombok.Getter;
 import lombok.Setter;