fix: changer le pattern de route newsletter (api/ réservé par Kirby)

- Pattern `api/newsletter` → `newsletter/subscribe`
- Ajout de config.localhost.php (gitignored) pour le dev local

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

.gitignore

@@ -53,6 +53,7 @@ Icon
 # ---------------
 
 /site/config/config.index.ngo.php
+/site/config/config.localhost.php
 
 
 # Content

assets/js/newsletter-brevo.js

@@ -1,7 +1,7 @@
 (function () {
   'use strict';
 
-  const PROXY_URL = '/api/newsletter';
+  const PROXY_URL = '/newsletter/subscribe';
 
   async function subscribeToNewsletter(email, attributes = {}) {
     const response = await fetch(PROXY_URL, {

site/config/routes/newsletter.php

@@ -1,7 +1,7 @@
 <?php
 
 return [
-  'pattern' => 'api/newsletter',
+  'pattern' => 'newsletter/subscribe',
   'method'  => 'POST|OPTIONS',
   'action'  => function () {
     header('Content-Type: application/json');