chore: update Node.js prerequisite to >= 24

AdonisJS requires Node.js 24+.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

Author: B4nan

README.md

@@ -21,7 +21,7 @@ Based on the [AdonisJS slim starter kit](https://github.com/adonisjs/slim-starte
 
 ## Prerequisites
 
-- Node.js >= 20
+- Node.js >= 24
 - npm
 
 ## Setup