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/twenty-sdk/src/cli/commands/app-generate.command.ts

@@ -0,0 +1,19 @@
+import chalk from 'chalk';
+import { GenerateService } from '../services/generate.service';
+import { CURRENT_EXECUTION_DIRECTORY } from '../constants/current-execution-directory';
+
+export class AppGenerateCommand {
+  private generateService = new GenerateService();
+
+  async execute(appPath: string = CURRENT_EXECUTION_DIRECTORY) {
+    try {
+      await this.generateService.generateClient(appPath);
+    } catch (error) {
+      console.error(
+        chalk.red('Generate Twenty client failed:'),
+        error instanceof Error ? error.message : error,
+      );
+      throw error;
+    }
+  }
+}