Improve apps (#19256)

- simplify the base application template
- remove --exhaustive option and replace by a --example option like in
next.js https://nextjs.org/docs/app/api-reference/cli
- Fix some bugs and logs
- add a post-card app in twenty-apps/examples/

packages/twenty-sdk/src/cli/operations/index.ts

@@ -27,6 +27,9 @@ export { serverStart } from './server-start';
 export type { ServerStartOptions, ServerStartResult } from './server-start';
 export { detectLocalServer } from '@/cli/utilities/server/detect-local-server';
 
+// Config
+export { ConfigService } from '@/cli/utilities/config/config-service';
+
 // Shared types and error codes
 export {
   APP_ERROR_CODES,