feat: add UUID id field to User entity and initialize in factory method

Author: otaviojava

src/main/java/org/soujava/samples/ai/patterns/planning/User.java

@@ -4,10 +4,15 @@
 import jakarta.nosql.Entity;
 import jakarta.nosql.Id;
 
+import java.util.UUID;
+
 @Entity
 public class User {
 
     @Id
+    private UUID id;
+
+    @Column
     private String email;
 
     @Column
@@ -28,6 +33,7 @@ public static User of(String email, String name) {
         User user = new User();
         user.email = email;
         user.name = name;
+        user.id = UUID.randomUUID();
         return user;
     }
 }