[plugin-valibot] add valibot plugin

[ikuru9]

Summary

This PR adds @kubb/plugin-valibot, a new validation plugin for generating Valibot schemas from OpenAPI specs.

What changed

• Added the new packages/plugin-valibot package with generator, printer, resolver, utils, and JSX components.
• Implemented Valibot-specific schema behavior for:
  • optional handling (optional, exactOptional, undefinedable)
  • default handling (defaultMode: 'default' | 'fallback')
  • metadata actions (title, description, examples, extensions)
  • readonly support
• Added package-level tests and snapshots for schema and operation generation.
• Wired the plugin into root workspace config, examples, e2e, performance, and registry metadata.
• Added a Valibot example app and refreshed package documentation.

Validation

• pnpm lint
• pnpm typecheck
• pnpm test
• pnpm --filter @kubb/plugin-valibot test
• pnpm --filter @kubb/plugin-valibot lint

Notes

• The change is intentionally structured to mirror the existing plugin layout used by other generators in the repo.
• A changeset was added for the package update.

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[changeset-bot]

🦋 Changeset detected

Latest commit: 0e095f5

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

This PR includes changesets to release 14 packages

Name	Type
@kubb/plugin-valibot	Patch
tests-3.0.x	Patch
e2e	Patch
performance	Patch
@kubb/plugin-client	Patch
@kubb/plugin-cypress	Patch
@kubb/plugin-faker	Patch
@kubb/plugin-mcp	Patch
@kubb/plugin-msw	Patch
@kubb/plugin-react-query	Patch
@kubb/plugin-redoc	Patch
@kubb/plugin-ts	Patch
@kubb/plugin-vue-query	Patch
@kubb/plugin-zod	Patch

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