[WIP] Remove playground project and related studio deployments

[Copilot]

Plan to Remove Playground Project and Studio Deployment

• Remove the apps/playground directory entirely
• Remove playground-related scripts from root package.json
• Update README.md to remove studio deployment link (play.objectstack.ai)
• Update docs/index.md to remove studio deployment link
• Update docs/guide/studio.md to remove studio deployment link
• Update docs/ROADMAP.md to remove playground references
• Update CONTRIBUTING.md to remove playground references
• Update VERIFICATION.md to remove playground references
• Update docs/lazy-loaded-plugins.md to remove playground references
• Build and verify the remaining packages still work

Summary

Successfully removed the apps/playground project and all references to the studio deployment URL (play.objectstack.ai) from the repository.

Changes Made:

1. Deleted: Entire apps/playground directory (75+ files)
2. Updated package.json: Removed playground and dev scripts, changed dev to use prototype instead
3. Updated documentation:
   • Replaced studio deployment links with references to the @object-ui/designer package
   • Updated examples to use pnpm designer or pnpm prototype instead of pnpm playground
   • Removed all references to play.objectstack.ai
4. Verified: All builds and tests pass successfully (95 tests passing across 16 test files)

Original prompt

删除playground项目，相关的studio部署和链接

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Project	Deployment	Review	Updated (UTC)
objectui-playground	Ready	Preview, Comment	Jan 15, 2026 7:01am

[github-actions]

✅ All checks passed!

• ✅ Type check passed
• ✅ Tests passed
• ✅ Lint check completed