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/widgets/table/ClientMemoryDataSource.php

@@ -0,0 +1,62 @@
+<?php namespace Backend\Widgets\Table;
+
+/**
+ * The client-memory data source for the Table widget.
+ */
+class ClientMemoryDataSource extends DataSourceBase
+{
+    /**
+     * @var array Keeps the data source data.
+     */
+    protected $data = [];
+
+    /**
+     * Initializes records in the data source.
+     * The method doesn't replace existing records and
+     * could be called multiple times in order to fill
+     * the data source.
+     * @param array $records Records to initialize in the data source.
+     */
+    public function initRecords($records)
+    {
+        $this->data = array_merge($this->data, $records);
+    }
+
+    /**
+     * Returns a total number of records in the data source.
+     * @return integer
+     */
+    public function getCount()
+    {
+        return count($this->data);
+    }
+
+    /**
+     * Removes all records from the data source.
+     */
+    public function purge()
+    {
+        $this->data = [];
+    }
+
+    /**
+     * Return records from the data source.
+     * @param integer $offset Specifies the offset of the first record to return, zero-based.
+     * @param integer $count Specifies the number of records to return.
+     * @return array Returns the records.
+     * If there are no more records, returns an empty array.
+     */
+    public function getRecords($offset, $count)
+    {
+        return array_slice($this->data, $offset, $count);
+    }
+
+    /**
+     * Returns all records in the data source.
+     * This method is specific only for the client memory data sources.
+     */
+    public function getAllRecords()
+    {
+        return $this->data;
+    }
+}