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/AttachManyModelTest.php

@@ -0,0 +1,57 @@
+<?php
+
+namespace System\Tests\Plugins\Database;
+
+use System\Tests\Bootstrap\PluginTestCase;
+use System\Models\File as FileModel;
+use Database\Tester\Models\User;
+use Model;
+
+class AttachManyModelTest extends PluginTestCase
+{
+    public function setUp() : void
+    {
+        parent::setUp();
+
+        include_once base_path() . '/modules/system/tests/fixtures/plugins/database/tester/models/User.php';
+
+        $this->runPluginRefreshCommand('Database.Tester');
+    }
+
+    public function testDeleteFlagDestroyRelationship()
+    {
+        Model::unguard();
+        $user = User::create(['name' => 'Stevie', 'email' => 'stevie@example.com']);
+        Model::reguard();
+
+        $this->assertEmpty($user->photos);
+        $user->photos()->create(['data' => base_path() . '/modules/system/tests/fixtures/plugins/database/tester/assets/images/avatar.png']);
+        $user->reloadRelations();
+        $this->assertNotEmpty($user->photos);
+
+        $photo = $user->photos->first();
+        $photoId = $photo->id;
+
+        $user->photos()->remove($photo);
+        $this->assertNull(FileModel::find($photoId));
+    }
+
+    public function testDeleteFlagDeleteModel()
+    {
+        Model::unguard();
+        $user = User::create(['name' => 'Stevie', 'email' => 'stevie@example.com']);
+        Model::reguard();
+
+        $this->assertEmpty($user->photos);
+        $user->photos()->create(['data' => base_path() . '/modules/system/tests/fixtures/plugins/database/tester/assets/images/avatar.png']);
+        $user->reloadRelations();
+        $this->assertNotEmpty($user->photos);
+
+        $photo = $user->photos->first();
+        $this->assertNotNull($photo);
+        $photoId = $photo->id;
+
+        $user->delete();
+        $this->assertNull(FileModel::find($photoId));
+    }
+}