Add next steps hint after test-app-init

Show 'symfony serve -d' command to guide users through the full setup flow.

Author: Rafikooo

composer.json

@@ -92,7 +92,8 @@
         ],
         "test-app-init": [
             "@database-reset",
-            "@frontend-clear"
+            "@frontend-clear",
+            "echo '\nNow run:\n\n  symfony serve -d\n'"
         ]
     }
 }