fuyou

Results 2 issues of fuyou

## Summary Fixes CLI crash caused by invalid configuration files by adding runtime validation for `settings.json`. Previously, malformed settings would cause the CLI to crash on startup without clear error...

## PR Checklist Please check if your PR fulfills the following requirements: - [x] The commit message follows our guidelines: https://github.com/nestjs/nest/blob/master/CONTRIBUTING.md - [x] Tests for the changes have been added...