Merge twenty-cli into twenty-sdk (#16150)

- Moves twenty-cli content into twenty-sdk
- add a new twenty-sdk:0.1.0 version
- this new twenty-sdk exports a cli command called 'twenty' (like
twenty-cli before)
- deprecates twenty-cli
- simplify app init command base-project
- use `twenty-sdk:0.1.0` in base project
- move the "twenty-sdk/application" barrel to "twenty-sdk"
- add `create-twenty-app` package

<img width="1512" height="919" alt="image"
src="https://github.com/user-attachments/assets/007bef45-4e71-419a-9213-cebed376adbf"
/>

<img width="1506" height="929" alt="image"
src="https://github.com/user-attachments/assets/3de2fec6-1624-4923-ae13-f4e1cf165eb5"
/>

packages/create-twenty-app/README.md

@@ -0,0 +1,91 @@
+<div align="center">
+  <a href="https://twenty.com">
+    <picture>
+      <img alt="Twenty logo" src="https://raw.githubusercontent.com/twentyhq/twenty/2f25922f4cd5bd61e1427c57c4f8ea224e1d552c/packages/twenty-website/public/images/core/logo.svg" height="128">
+    </picture>
+  </a>
+  <h1>Create Twenty App</h1>
+
+<a href="https://www.npmjs.com/package/create-twenty-app"><img alt="NPM version" src="https://img.shields.io/npm/v/create-twenty-app.svg?style=for-the-badge&labelColor=000000"></a>
+<a href="https://github.com/twentyhq/twenty/blob/main/LICENSE"><img alt="License" src="https://img.shields.io/npm/l/next.svg?style=for-the-badge&labelColor=000000"></a>
+<a href="https://discord.gg/cx5n4Jzs57"><img alt="Join the community on Discord" src="https://img.shields.io/badge/Join%20the%20community-blueviolet.svg?style=for-the-badge&logo=Twenty&labelColor=000000&logoWidth=20"></a>
+
+</div>
+
+Create Twenty App is the official scaffolding CLI for building apps on top of [Twenty CRM](https://twenty.com). It sets up a ready‑to‑run project that works seamlessly with the [twenty-sdk](https://www.npmjs.com/package/twenty-sdk).
+
+- Zero‑config project bootstrap
+- Preconfigured scripts for auth, generate, dev sync, one‑off sync, uninstall
+- Strong TypeScript support and typed client generation
+
+## Prerequisites
+- Node.js 18+ (recommended) and Yarn 4
+- A Twenty workspace and an API key (create one at https://app.twenty.com/settings/api-webhooks)
+
+## Quick start
+```bash
+npx create-twenty-app@latest my-twenty-app
+cd my-twenty-app
+
+# Authenticate using your API key (you'll be prompted)
+yarn auth
+
+# Add a new entity to your application (guided)
+yarn create-entity
+
+# Generate a typed Twenty client and workspace entity types
+yarn generate
+
+# Start dev mode: automatically syncs local changes to your workspace
+yarn dev
+
+# Or run a one‑time sync
+yarn sync
+
+# Uninstall the application from the current workspace
+yarn uninstall
+```
+
+## What gets scaffolded
+- A minimal app structure ready for Twenty
+- TypeScript configuration
+- Prewired scripts that wrap the `twenty` CLI from twenty-sdk
+- Example placeholders to help you add entities, actions, and sync logic
+
+## Next steps
+- Explore the generated project and add your first entity with `yarn create-entity`.
+- Keep your types up‑to‑date using `yarn generate`.
+- Use `yarn dev` while you iterate to see changes instantly in your workspace.
+
+
+## Publish your application
+Applications are currently stored in `twenty/packages/twenty-apps`.
+
+You can share your application with all Twenty users:
+
+```bash
+# pull the Twenty project
+git clone https://github.com/twentyhq/twenty.git
+cd twenty
+
+# create a new branch
+git checkout -b feature/my-awesome-app
+```
+
+- Copy your app folder into `twenty/packages/twenty-apps`.
+- Commit your changes and open a pull request on https://github.com/twentyhq/twenty
+
+```bash
+git commit -m "Add new application"
+git push
+```
+
+Our team reviews contributions for quality, security, and reusability before merging.
+
+## Troubleshooting
+- Auth prompts not appearing: run `yarn auth` again and verify the API key permissions.
+- Types not generated: ensure `yarn generate` runs without errors, then re‑start `yarn dev`.
+
+## Contributing
+- See our [GitHub](https://github.com/twentyhq/twenty)
+- Join our [Discord](https://discord.gg/cx5n4Jzs57)