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/classes/WidgetManagerTest.php

@@ -0,0 +1,49 @@
+<?php
+
+namespace Backend\Tests\Classes;
+
+use System\Tests\Bootstrap\TestCase;
+use Backend\Classes\WidgetManager;
+
+class WidgetManagerTest extends TestCase
+{
+    public function testListFormWidgets()
+    {
+        $manager = WidgetManager::instance();
+        $widgets = $manager->listFormWidgets();
+
+        $this->assertArrayHasKey('TestVendor\Test\FormWidgets\Sample', $widgets);
+        $this->assertArrayHasKey('Winter\Tester\FormWidgets\Preview', $widgets);
+    }
+
+    public function testIfWidgetsCanBeExtended()
+    {
+        $manager = WidgetManager::instance();
+        $manager->registerReportWidget('Acme\Fake\ReportWidget\HelloWorld', [
+            'name' => 'Hello World Test',
+            'context' => 'dashboard'
+        ]);
+        $widgets = $manager->listReportWidgets();
+
+        $this->assertArrayHasKey('Acme\Fake\ReportWidget\HelloWorld', $widgets);
+    }
+
+    public function testIfWidgetsCanBeRemoved()
+    {
+        $manager = WidgetManager::instance();
+        $manager->registerReportWidget('Acme\Fake\ReportWidget\HelloWorld', [
+            'name' => 'Hello World Test',
+            'context' => 'dashboard'
+        ]);
+        $manager->registerReportWidget('Acme\Fake\ReportWidget\ByeWorld', [
+            'name' => 'Hello World Bye',
+            'context' => 'dashboard'
+        ]);
+
+        $manager->removeReportWidget('Acme\Fake\ReportWidget\ByeWorld');
+
+        $widgets = $manager->listReportWidgets();
+
+        $this->assertCount(1, $widgets);
+    }
+}