fix: add X-Api-Key header to API feature tests and register auth routes

tests/Feature/Api/AuthControllerTest.php

@@ -5,6 +5,10 @@ use Illuminate\Foundation\Testing\RefreshDatabase;
 
 uses(RefreshDatabase::class);
 
+beforeEach(function () {
+    $this->withHeaders(['X-Api-Key' => config('app.api_secret_key')]);
+});
+
 it('registers a new user and returns a token', function () {
     $this->postJson('/api/auth/register', [
         'name' => 'Test User',