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/tests/plugins/database/PluginModelTest.php

@@ -0,0 +1,36 @@
+<?php
+
+namespace System\Tests\Plugins\Database;
+
+use System\Tests\Bootstrap\PluginTestCase;
+use Database\Tester\Models\Post;
+
+class PluginModelTest extends PluginTestCase
+{
+    public function setUp() : void
+    {
+        parent::setUp();
+
+        include_once base_path() . '/modules/system/tests/fixtures/plugins/database/tester/models/Post.php';
+
+        $this->runPluginRefreshCommand('Database.Tester');
+    }
+
+    public function testCreateFirstPost()
+    {
+        Post::truncate();
+        $post = new Post;
+        $post->title = "First post";
+        $post->description = "Yay!!";
+        $post->save();
+        $this->assertEquals(1, $post->id);
+    }
+
+    public function testGuardedAttribute()
+    {
+        $this->expectException(\Illuminate\Database\Eloquent\MassAssignmentException::class);
+        $this->expectExceptionMessageMatches('/title/');
+
+        Post::create(['title' => 'Hi!', 'slug' => 'authenticity']);
+    }
+}