feat: VivesPOS landing on Winter CMS 1.2 — theme + plugin + Dockerfile

- Base: wintercms/winter branch 1.2 (full framework)
- Theme vivespos: Canvas 7 + Bootstrap 5 CDN, custom CSS
- Layout: deferred GTM/GA4 tracking, JSON-LD SoftwareApplication
- Partials: hero (offline-first), features, modes (offline/nube toggle),
  screenshots, pricing (3 planes), comparison, FAQ, CTA
- Plugin VivesPOS.Site with ContactForm
- Dockerfile: PHP 8.2 Apache, port 80, healthcheck
- Added winter/wn-pages, blog, sitemap, seo plugins
- Active theme set to vivespos

modules/backend/tests/fixtures/models/UserFixture.php

@@ -0,0 +1,66 @@
+<?php
+
+namespace Backend\Tests\Fixtures\Models;
+
+use Backend\Models\User;
+
+class UserFixture extends User
+{
+    public function __construct(array $attributes = [])
+    {
+        parent::__construct($attributes);
+
+        $this->fill([
+            'first_name' => 'Test',
+            'last_name' => 'User',
+            'login' => 'testuser',
+            'email' => 'testuser@test.com',
+            'password' => '',
+            'activation_code' => null,
+            'persist_code' => null,
+            'reset_password_code' => null,
+            'permissions' => null,
+            'is_activated' => true,
+            'role_id' => null,
+            'activated_at' => null,
+            'last_login' => '2019-09-27 12:00:00',
+            'created_at' => '2019-09-27 12:00:00',
+            'updated_at' => '2019-09-27 12:00:00',
+            'deleted_at' => null,
+            'is_superuser' => false
+        ]);
+    }
+
+    public function asSuperUser()
+    {
+        $this->setAttribute('is_superuser', true);
+
+        return $this;
+    }
+
+    public function asDeletedUser()
+    {
+        $this->setAttribute('deleted_at', date('Y-m-d H:i:s'));
+
+        return $this;
+    }
+
+    public function withPermission($permission, bool $granted = true)
+    {
+        $currentPermissions = $this->getAttribute('permissions');
+
+        if (is_string($permission)) {
+            $permission = [
+                $permission => (int) $granted
+            ];
+        }
+
+        if (is_array($currentPermissions)) {
+            $this->setAttribute('permissions', array_replace($currentPermissions, $permission));
+        } else {
+            $this->setAttribute('permissions', $permission);
+        }
+
+        return $this;
+    }
+}