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/system/console/scaffold/test/test.plugin.stub

@@ -0,0 +1,37 @@
+<?php
+
+namespace {{ plugin_namespace }}\Tests\Unit;
+
+use {{ plugin_namespace }}\Plugin;
+use System\Classes\PluginBase;
+use System\Tests\Bootstrap\PluginTestCase;
+
+class PluginTest extends PluginTestCase
+{
+    protected PluginBase $plugin;
+
+    public function setUp(): void
+    {
+        $this->plugin = new Plugin($this->createApplication());
+    }
+
+    public function testPluginDetails()
+    {
+        $details = $this->plugin->pluginDetails();
+
+        $this->assertIsArray($details);
+        $this->assertArrayHasKey('name', $details);
+        $this->assertArrayHasKey('description', $details);
+        $this->assertArrayHasKey('icon', $details);
+        $this->assertArrayHasKey('author', $details);
+
+        $this->assertEquals('{{ author }}', $details['author']);
+    }
+
+    public function testRegisterPermissions()
+    {
+        $permissions = $this->plugin->registerPermissions();
+
+        $this->assertIsArray($permissions);
+    }
+}