feat: modernize monaco react

[exKAZUu]

Summary

• Applied the wbfy project baseline: Yarn 4, oxlint/oxfmt, lefthook, reusable workflows, agent docs, and modern repository metadata.
• Modernized package publishing with ESM/CJS exports, React 19 dev/test dependencies, @willbooster/monaco-loader@1.0.0, and a TSX-capable tsup build that preserves the client entry directive for Next.js.
• Added semantic-release configuration expected by the shared WillBooster CI release dry-run.
• Removed the old demo/playground apps and added a focused Next.js 16.2.4 App Router e2e test that renders Editor, DiffEditor, and useMonaco through a Client Component.
• Replaced the stale upstream-heavy README with current WillBooster package usage and development commands.

Why

• This fork was still carrying old project infrastructure and the old @monaco-editor/loader dependency.
• The package needs to work in the latest Next.js App Router flow, where React hook-based editor exports must be consumed from Client Components.
• Keeping the e2e app small makes the Next.js compatibility check fast and directly tied to the package API.

Testing

• yarn check-for-ai
• yarn typecheck
• yarn test
• node node_modules/semantic-release/bin/semantic-release.js --dry-run
• GitHub Actions: Test workflow passed on the latest branch commit.

Notes

• yarn check-for-ai currently reports 10 warnings from stricter inherited lint rules, but exits successfully with 0 errors.
• next@16.2.4 was confirmed as the current npm version before adding the e2e app.

[gemini-code-assist]

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