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"
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packages/twenty-cli/README.md

@@ -1,13 +1,16 @@
-# Why Twenty CLI?
+# Deprecated: twenty-cli
 
-A command-line interface to easily scaffold, develop, and publish applications that extend Twenty CRM
-
-## Installation
+This package is deprecated. Please install and use twenty-sdk instead:
 
 ```bash
-npm install -g twenty-cli
+npm uninstall twenty-cli
+npm install -g twenty-sdk
 ```
 
+The command name remains the same: twenty.
+
+A command-line interface to easily scaffold, develop, and publish applications that extend Twenty CRM (now provided by twenty-sdk).
+
 ## Requirements
 - yarn >= 4.9.2
 - an `apiKey`. Go to `https://twenty.com/settings/api-webhooks` to generate one