Refactor action and route handlers to use async schema validation (#361)

- Removed the `zodParseFactory` utility and replaced it with direct async schema validation using `safeParseAsync` in both `enhanceAction` and `enhanceRouteHandler`.
- Improved error handling to return meaningful messages for invalid request bodies.
- Streamlined the codebase by deleting the now-unnecessary `utils/index.ts` file.

package.json

@@ -1,6 +1,6 @@
 {
   "name": "next-supabase-saas-kit-turbo",
-  "version": "2.15.0",
+  "version": "2.15.1",
   "private": true,
   "sideEffects": false,
   "engines": {