chore: anade scripts npm para arrancar el playground y construir

package.json

@@ -2,7 +2,15 @@
   "name": "@org/source",
   "version": "0.0.0",
   "license": "MIT",
-  "scripts": {},
+  "scripts": {
+    "start": "nx serve playground",
+    "playground": "nx serve playground",
+    "build": "nx build ui",
+    "build:playground": "nx build playground",
+    "build:all": "nx run-many -t build",
+    "lint": "nx lint ui",
+    "format": "prettier --write \"{apps,libs}/**/*.{ts,html,scss,md}\""
+  },
   "private": true,
   "dependencies": {
     "@angular-devkit/build-angular": "22.0.6",