rename to file, isKit, directory

[jycouet]

Singular form — file.viteConfig reads better than files.viteConfig since each property refers to a single file path.

Pure mechanical rename, no logic changes.

Prep for community add-on improvements.

---

I'm thinking also to switch:

/** If we are in a kit project, this object will contain the lib and routes directories */
kit: { libDirectory: string; routesDirectory: string } | undefined;

to

isKit: boolean
directory: {
  lib: string,
  routes: string
}

So that directory has good default in non-kit as well!

[changeset-bot]

🦋 Changeset detected

Latest commit: 46fc659

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 1 package

Name	Type
sv	Patch

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commit: 46fc659