Update dependency fumadocs-mdx to v12

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This PR contains the following updates:

Package	Change	Age	Confidence
fumadocs-mdx (source)	11.10.1 -> 12.0.0

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Release Notes

fuma-nama/fumadocs (fumadocs-mdx)

v12.0.0

Compare Source

Major Changes

• f11f89d: [Next.js] Rename APIS

  On page data:

  • _file -> info.
  • _file.absolutePath -> info.fullPath.

• effe43d: Drop support for Zod 3 schemas

  Zod 3 schemas are still allowed, but you can no longer extend on the Zod 4 schemas provided by Fumadocs.

• 2862a10: [Next.js] Removed content on page data in favour of getText().

Minor Changes

• 22e0fec: Support getText() & Postprocess API
• 2862a10: Unify doc collection entry for both Vite and Next.js integrations

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