Add sdk build (#17335)

## Summary

Adds `app:build` command as a one-shot version of `app:dev` - builds
manifest, functions, and front components once then exits (no watching).

**Changes:**
- Added `watch` option to `FunctionsWatcher` and
`FrontComponentsWatcher` to support both watch and one-shot modes
- Created `AppBuildCommand` reusing the same build logic as `app:dev`
with `watch: false`
- Added integration tests for `app:build` on both `rich-app` and
`root-app`
- Updated manifest types: `handlerPath` → `sourceHandlerPath` +
`builtHandlerPath`, `componentPath` → `sourceComponentPath` +
`builtComponentPath`
- Updated test app `package.json` scripts to match `create-twenty-app`
template

packages/create-twenty-app/src/utils/app-template.ts

@@ -198,6 +198,7 @@ const createPackageJson = async ({
       'auth:switch': 'twenty auth:switch',
       'auth:list': 'twenty auth:list',
       'app:dev': 'twenty app:dev',
+      'app:build': 'twenty app:build',
       'app:sync': 'twenty app:sync',
       'entity:add': 'twenty entity:add',
       'app:generate': 'twenty app:generate',