Retire clé export et ajoute demo

src/lib/admin.php

@@ -3,6 +3,10 @@
 require_once __DIR__ . '/common.php';
 
 function gridtv_require_admin(array $config, string $page_title = 'Admin'): array {
+    if (gridtv_is_demo_mode()) {
+        return ['unlocked' => true, 'error' => '', 'demo' => true];
+    }
+
     if (session_status() !== PHP_SESSION_ACTIVE) {
         session_start();
     }
@@ -12,7 +16,7 @@ function gridtv_require_admin(array $config, string $page_title = 'Admin'): arra
     $error = '';
 
     if ($admin_key !== '' && hash_equals($admin_key, (string) $session_key)) {
-        return ['unlocked' => true, 'error' => ''];
+        return ['unlocked' => true, 'error' => '', 'demo' => false];
     }
 
     if ($_SERVER['REQUEST_METHOD'] === 'POST' && isset($_POST['admin_key_input'])) {

src/lib/common.php

@@ -4,6 +4,14 @@ function gridtv_config_path(): string {
     return dirname(__DIR__, 2) . '/config.json';
 }
 
+function gridtv_demo_path(): string {
+    return dirname(__DIR__, 2) . '/.demo';
+}
+
+function gridtv_is_demo_mode(): bool {
+    return file_exists(gridtv_demo_path());
+}
+
 function gridtv_load_config(): array {
     $config_path = gridtv_config_path();
     if (!file_exists($config_path)) {