perf(CreateUserController): añadido control de excepción para valores únicos

src/main/java/com/example/apprecetas/user/infrastructure/controller/CreateUserController.java

@@ -31,8 +31,12 @@ public class CreateUserController {
                     .collect(Collectors.joining("; "));
             throw new UnprocessableEntityException(errorMsg);
         }
+        try {
             URI location = URI.create("/user");
             return ResponseEntity.created(location).body(service.create(userInputDto));
+        } catch (Exception e) {
+            throw new UnprocessableEntityException("Usuario ya registrado. Cambie sus credenciales.");
+        }
     }
 
 }