fix: custom Authenticate middleware returns null redirectTo — prevents Route[login] not defined 500

backend/app/Http/Middleware/Authenticate.php

@@ -0,0 +1,18 @@
+<?php
+
+namespace App\Http\Middleware;
+
+use Illuminate\Auth\Middleware\Authenticate as Middleware;
+use Illuminate\Http\Request;
+
+class Authenticate extends Middleware
+{
+    /**
+     * API-only project — never redirect, always return null so Laravel
+     * responds with a 401 JSON response instead of looking for a "login" route.
+     */
+    protected function redirectTo(Request $request): ?string
+    {
+        return null;
+    }
+}