fix(types): make react peer dependency optional (#6115)

[Shauryan0207]

Description

@plone/types requires React but can be used in non-React frameworks (Astro, SvelteKit) for API type definitions. Made React peer dependency optional so users only needing REST API types don't have to install React.

Changes

• Made react peer dependency optional in peerDependenciesMeta
• Added documentation for using package without React
• Content and services types remain React-agnostic

Checklist

• I signed the Plone Contributor Agreement
• Verified no other PRs for this change
• Followed Volto contribution guidelines
• No tests needed (dependency/doc update)
• Added changelog entry: packages/types/news/6115.bugfix
• Updated README with usage examples

Related

Closes #6115

[mister-roboto]

@Shauryan0207 you need to sign the Plone Contributor Agreement to merge this pull request.

Learn about the Plone Contributor Agreement: https://plone.org/foundation/contributors-agreement

If you have already signed the agreement, please allow a week for your agreement to be processed.
Once it is processed, you will receive an email invitation to join the plone GitHub organization as a Contributor.

If after a week you have not received an invitation, then please contact agreements@plone.org.

[Shauryan0207]

I have signed it

[stevepiercy]

@Shauryan0207 please read and follow the third and fourth sentences. After that's completed, then add a comment stating that you've completed the process.

[Shauryan0207]

@Shauryan0207 please read and follow the third and fourth sentences. After that's completed, then add a comment stating that you've completed the process.

Sure thank you