[Bug]: Pydantic serialization error

### What happened?

A bug happened with the BFF
/{version}/ecoindexes/latest

### Project

Ecoindex API

### What OS do you use?

_No response_

### urls

_No response_

### Relevant log output

```shell
ecoindex-api-backend | Expected `datetime` but got `str` - serialized value may not be as expected
ecoindex-api-backend | Expected `uuid` but got `str` - serialized value may not be as expected
ecoindex-api-backend | Expected `datetime` but got `str` - serialized value may not be as expected
ecoindex-api-backend | Expected `uuid` but got `str` - serialized value may not be as expected
ecoindex-api-backend | Expected `datetime` but got `str` - serialized value may not be as expected
ecoindex-api-backend | Expected `uuid` but got `str` - serialized value may not be as expected
ecoindex-api-backend | Expected `datetime` but got `str` - serialized value may not be as expected
ecoindex-api-backend | Expected `uuid` but got `str` - serialized value may not be as expected
ecoindex-api-backend | Expected `datetime` but got `str` - serialized value may not be as expected
ecoindex-api-backend | Expected `uuid` but got `str` - serialized value may not be as expected
ecoindex-api-backend | Expected `datetime` but got `str` - serialized value may not be as expected
ecoindex-api-backend | Expected `uuid` but got `str` - serialized value may not be as expected
ecoindex-api-backend | Expected `datetime` but got `str` - serialized value may not be as expected
ecoindex-api-backend | Expected `uuid` but got `str` - serialized value may not be as expected
ecoindex-api-backend | Expected `datetime` but got `str` - serialized value may not be as expected
ecoindex-api-backend | Expected `uuid` but got `str` - serialized value may not be as expected
ecoindex-api-backend | Expected `datetime` but got `str` - serialized value may not be as expected
ecoindex-api-backend | Expected `uuid` but got `str` - serialized value may not be as expected
ecoindex-api-backend | Expected `datetime` but got `str` - serialized value may not be as expected
ecoindex-api-backend | Expected `uuid` but got `str` - serialized value may not be as expected
ecoindex-api-backend | Expected `datetime` but got `str` - serialized value may not be as expected
ecoindex-api-backend | Expected `uuid` but got `str` - serialized value may not be as expected
ecoindex-api-backend | Expected `datetime` but got `str` - serialized value may not be as expected
ecoindex-api-backend | Expected `uuid` but got `str` - serialized value may not be as expected
ecoindex-api-backend | Expected `datetime` but got `str` - serialized value may not be as expected
ecoindex-api-backend | Expected `uuid` but got `str` - serialized value may not be as expected
ecoindex-api-backend | Expected `datetime` but got `str` - serialized value may not be as expected
ecoindex-api-backend | Expected `uuid` but got `str` - serialized value may not be as expected
ecoindex-api-backend | Expected `datetime` but got `str` - serialized value may not be as expected
ecoindex-api-backend | Expected `uuid` but got `str` - serialized value may not be as expected
ecoindex-api-backend | Expected `datetime` but got `str` - serialized value may not be as expected
ecoindex-api-backend | Expected `uuid` but got `str` - serialized value may not be as expected
ecoindex-api-backend | Expected `datetime` but got `str` - serialized value may not be as expected
ecoindex-api-backend | Expected `uuid` but got `str` - serialized value may not be as expected
ecoindex-api-backend | Expected `datetime` but got `str` - serialized value may not be as expected
ecoindex-api-backend | Expected `uuid` but got `str` - serialized value may not be as expected
ecoindex-api-backend | Expected `datetime` but got `str` - serialized value may not be as expected
ecoindex-api-backend | Expected `uuid` but got `str` - serialized value may not be as expected
ecoindex-api-backend | Expected `datetime` but got `str` - serialized value may not be as expected
ecoindex-api-backend | Expected `uuid` but got `str` - serialized value may not be as expected
ecoindex-api-backend | return self.serializer.to_python(
```

### Code of Conduct

- [X] I agree to follow this project's Code of Conduct

Tái hiện request BFF /{version}/ecoindexes/latest và kiểm tra đường dẫn serialization Pydantic của route cùng các response model. Theo dõi lý do các giá trị datetime và UUID đến bước serialization dưới dạng chuỗi; hoàn tất khi endpoint trả về response như mong đợi mà không có các cảnh báo serialization đã được báo cáo.

Do mô hình lập chỉ mục viết ra từ nội dung của issue.