Remove previous onboarding implementation

backend/app/Services/OnboardingRedirectService.php

@@ -1,20 +0,0 @@
-<?php
-
-namespace App\Services;
-
-use Illuminate\Http\RedirectResponse;
-use Illuminate\Http\Request;
-
-class OnboardingRedirectService
-{
-    public static function handleRedirect(Request $request, string $defaultRoute, string $successMessage): RedirectResponse
-    {
-        $redirectTo = $request->input('redirect_to');
-        
-        if ($redirectTo) {
-            return redirect($redirectTo)->with('success', $successMessage);
-        }
-
-        return redirect()->route($defaultRoute)->with('success', $successMessage);
-    }
-}