docs(website): add OriginJS Vite migration guide

[dmchoi77]

Description

Adds an OriginJS to @module-federation/vite migration guide to the Vite integration documentation.

The guide covers supported environments, complete OriginJS and mf-vite remote/host configuration examples, dynamic remote migration, shared dependency and CSS considerations, and incremental deployment guidance.

Reference: module-federation/vite#956

Validation

• Ran pnpm exec prettier --check apps/website-new/docs/en/integrations/build-tool/vite.mdx
• Ran git diff --check

Related Issue

N/A — documentation-only migration guide.

Types of changes

• Docs change / refactoring / dependency upgrade
• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)

Checklist

• I have added tests to cover my changes.
• All new and existing tests passed.
• I have updated the documentation.

[changeset-bot]

⚠️ No Changeset found

Latest commit: 376039c

Merging this PR will not cause a version bump for any packages. If these changes should not result in a new version, you're good to go. If these changes should result in a version bump, you need to add a changeset.

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[chatgpt-codex-connector]

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Reviewed commit: 376039cf8f

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[chatgpt-codex-connector]

Add a result type before reading default

For TypeScript hosts copying this example, loadRemote declares an uninferred generic result (packages/runtime/src/index.ts:56-58), so this call produces an unknown-like value and module?.default fails strict compilation with TS2339: Property 'default' does not exist on type '{}'. Supply a generic module shape (or otherwise narrow the result) before accessing its default export.

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