perf(UserDocument): añadida restricción de valor único a email y username

src/main/java/com/example/apprecetas/user/infrastructure/repository/mongodb/UserDocument.java

 package com.example.apprecetas.user.infrastructure.repository.mongodb;
 
-import jakarta.persistence.*;
 import lombok.Getter;
 import lombok.Setter;
+import org.springframework.data.annotation.Id;
+import org.springframework.data.mongodb.core.index.Indexed;
 import org.springframework.data.mongodb.core.mapping.Document;
 
+
 @Document(collection = "users")
 @Getter
 @Setter
 public class UserDocument {
 
     @Id
-    @Column(name = "id_usuario")
     private String id;
-
-    @Column(name = "nombre")
     private String name;
-
-    @Column(name = "apellidos")
     private String surname;
 
-    @Column(name = "email", unique = true)
+    @Indexed(unique = true)
     private String email;
-
-    @Column(name = "password")
     private String password;
 
-    @Column(name = "usuario", unique = true)
+    @Indexed(unique = true)
     private String username;
 
 }