feat(copilotkit): add OpenUI adapter package

[vishxrad]

What

Add a first-party @openuidev/copilotkit package so CopilotKit can own the chat shell, agent transport, and lifecycle while OpenUI renders streaming tool interfaces and returns user actions.

Closes #1100.

Changes

• add aligned present_openui frontend and prompt_openui human-in-the-loop tools
• add OpenUIProvider hook registration, model instructions, renderer factories, theming, replay, follow-up continuation, and form response handling
• add unit coverage for tool configuration, provider registration, charts and actions, duplicate-run guards, form submission, replay, theming, URLs, and post-stream errors
• add a standalone Next.js CopilotKit example with a live model runtime
• add API documentation, integration catalog metadata, and npm publication workflow support

Test Plan

• Not applicable
• Verified locally
  • pnpm run ci, build, publint, and Are The Types Wrong in packages/copilotkit
  • lint and production build in examples/frontend-platforms/copilotkit
  • type check and production build in docs
  • packed package metadata inspection with workspace and catalog protocols resolved
  • live browser acceptance with a chart, table, follow-up click, and human-in-the-loop form submission

Checklist

• I linked a related issue, if applicable
• I updated docs/README when needed
• I considered backwards compatibility

[vercel]

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