feat(auth): complete registration anti-spam and quota hardening

config/services.php

@@ -47,4 +47,11 @@ return [
         'timeout' => (int) env('RECAPTCHA_TIMEOUT', 5),
     ],
 
+    'turnstile' => [
+        'site_key' => env('TURNSTILE_SITE_KEY'),
+        'secret_key' => env('TURNSTILE_SECRET_KEY'),
+        'verify_url' => env('TURNSTILE_VERIFY_URL', 'https://challenges.cloudflare.com/turnstile/v0/siteverify'),
+        'timeout' => (int) env('TURNSTILE_TIMEOUT', 5),
+    ],
+
 ];