fix: use serverDir instead of srcDir for new Nuxt 4 file structure

[blqke]

Nuxt 4 introduces a new default directory structure

With this new structure enabled on a Nuxt 3 project using the following configuration:

future: {
  compatibilityVersion: 4,
}

This module is not working anymore, because the module resolve cron directory to <srcDir> which is app/ by default, and therefore tries to resolve
app/server/cron/ by default, and not server/cron/,

Check it here -> https://stackblitz.com/edit/github-hessqh?file=src/module.ts

I believe it should try to resolve <serverDir>, which by default is <rootDir>/server when compatibilityVersion: is set to 4, and <srcDir>/server otherwise.

I believe there is no breaking change for those who havent migrated to the new structure.

[hywax-assistant]

👋 @blqke

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[hywax]

Hi, I saw that nuxt changed the structure. Thank you for your PR. I will do a merge of your commit shortly

[hywax-assistant]

👋 @blqke Congrats on merging your first pull request! 🎉