fix(nuxt,schema): move config type to schema + mark type peerDeps

[danielroe]

🔗 Linked issue

📚 Description

this moves the source of truth for DefineNuxtConfig to @nuxt/schema - which is also of course where the configuration itself is located.

additionally, we use optional peerDependencies for the type artifacts that persist

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[socket-security]

Review the following changes in direct dependencies. Learn more about Socket for GitHub.

Diff	Package	Supply Chain Security	Vulnerability	Quality	Maintenance	License
	tinyglobby@​0.2.15
	ignore@​7.0.5
	pathe@​2.0.3
	jiti@​2.6.1
	webpack-hot-middleware@​2.26.1
	semver@​7.7.4
	magic-string@​0.30.21
	picomatch@​4.0.4

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[socket-security]

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Review the following alerts detected in dependencies.

According to your organization's Security Policy, it is recommended to resolve "Warn" alerts. Learn more about Socket for GitHub.

Action	Severity	Alert  (click "▶" to expand/collapse)
Warn		Obfuscated code: npm markdown-it is 91.0% likely obfuscated Confidence: 0.91 Location: Package overview From: pnpm-lock.yaml → npm/markdown-it@14.1.1 ℹ Read more on: This package | This alert | What is obfuscated code? Next steps: Take a moment to review the security alert above. Review the linked package source code to understand the potential risk. Ensure the package is not malicious before proceeding. If you're unsure how to proceed, reach out to your security team or ask the Socket team for help at support@socket.dev. Suggestion: Packages should not obfuscate their code. Consider not using packages with obfuscated code. Mark the package as acceptable risk. To ignore this alert only in this pull request, reply with the comment @SocketSecurity ignore npm/markdown-it@14.1.1. You can also ignore all packages with @SocketSecurity ignore-all. To ignore an alert for all future pull requests, use Socket's Dashboard to change the triage state of this alert.

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[pkg-pr-new]

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@nuxt/kit

npm i https://pkg.pr.new/@nuxt/kit@34864

@nuxt/nitro-server

npm i https://pkg.pr.new/@nuxt/nitro-server@34864

nuxt

npm i https://pkg.pr.new/nuxt@34864

@nuxt/rspack-builder

npm i https://pkg.pr.new/@nuxt/rspack-builder@34864

@nuxt/schema

npm i https://pkg.pr.new/@nuxt/schema@34864

@nuxt/vite-builder

npm i https://pkg.pr.new/@nuxt/vite-builder@34864

@nuxt/webpack-builder

npm i https://pkg.pr.new/@nuxt/webpack-builder@34864

commit: 621d814

[codspeed-hq]

Merging this PR will not alter performance

✅ 20 untouched benchmarks
⏩ 3 skipped benchmarks¹

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_{Comparing fix/nuxt-config-type (621d814) with main (3a2e081)}

Footnotes

1. 3 benchmarks were skipped, so the baseline results were used instead. If they were deleted from the codebase, click here and archive them to remove them from the performance reports. ↩