add CORS manager with relative docs

bootstrap.php

@@ -7,6 +7,7 @@ require_once __DIR__ . '/vendor/autoload.php';
 use Api\Core\Container;
 use Api\Core\Config;
 use Api\Core\HttpClient;
+use Api\Core\CorsManager;
 use Api\Core\RateLimiter\RateLimiterInterface;
 use Api\Core\RateLimiter\FileRateLimiter;
 use Api\Core\RateLimiter\InMemoryRateLimiter;
@@ -25,6 +26,13 @@ $container->singleton(HttpClient::class, function() {
     return new HttpClient();
 });
 
+// CORS manager binding
+$container->singleton(CorsManager::class, function($c) {
+    $config = $c->make(Config::class);
+    $corsConfig = $config->get('cors', []);
+    return new CorsManager($corsConfig);
+});
+
 // Rate limiter driver configurabile via config or env: 'file' or 'memory'
 $rlDriver = $config->get('rate_limiter_driver', 'file');