add kirby-loop plugin with French translations

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

site/plugins/loop/src/Middleware.php

@@ -0,0 +1,49 @@
+<?php
+
+namespace Moinframe\Loop;
+
+use Kirby\Http\Response;
+
+class Middleware
+{
+    /**
+     * Authentication middleware
+     * @param callable $next The next action to execute
+     * @return callable Middleware function
+     */
+    public static function auth(callable $next): callable
+    {
+        return function () use ($next) {
+
+            // Check if loop is enabled
+            if (!Options::enabled()) {
+                return Response::json([
+                    'status' => 'error',
+                    'message' => 'Loop is disabled',
+                    'code' => 'DISABLED'
+                ], 403);
+            }
+
+            $csrfToken = kirby()->request()->header('X-CSRF-Token');
+            if (csrf($csrfToken) !== true) {
+                return Response::json([
+                    'status' => 'error',
+                    'message' => t('moinframe.loop.csrf.invalid'),
+                    'code' => 'CSRF_INVALID'
+                ], 403);
+            }
+
+
+            if (Options::public() === false && kirby()->user() === null) {
+                return Response::json([
+                    'status' => 'error',
+                    'message' => 'Unauthorized',
+                    'code' => 'UNAUTHORIZED'
+                ], 401);
+            }
+
+
+            return $next(...func_get_args());
+        };
+    }
+}