lb4 relation doesn't find models

Describe the bug

I have a project with a lot of models. I organized the models in "sub directories" inside "models" directory.
The "export" is working properly and all the project is working.
What is not working is the possibility to add repositories, relations or anything else
"lb4 relation" stops with an error "Generation is aborted: Error: No models found in ".../src/models"."
I expect the script to be capable to look for models also inside according to what is available in "index.ts" from "models" directory.

Logs

No response

Additional information

No response

Reproduction

https://github.com/danysz/demo-lb4-cli-model-not-found

先从 lb4 relation 命令和 issue 中链接的复现项目开始，然后检查它如何扫描 src/models 以及如何使用该目录的 index.ts。当组织在子目录中的模型能够被发现并用于 relation 或 repository 生成，而不是产生“No models found.”时，这项工作就完成了。