Initial commit: ws_vatcheck at v1.0.3

Includes the fix for the GR/EL VAT prefix bug that broke exemption for
every Greek VAT number (in_array-on-values vs array_key_exists in
CacheTaxManager/VatNumber, plus the missing use import in
EuValidatorAdapter). Adds IMPROVEMENTS.txt with a checklist of features
adopted from comparing against the vatchecker module (offline-fallback
policy, failure logging, company-name check, configurable EU country
list, per-product exclusion, GB/XI mapping, AJAX live validation,
address-priority strategy).

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>

src/Console/WebOutput.php

@@ -0,0 +1,88 @@
+<?php
+
+namespace Websmid\VatCheck\Console;
+
+use Symfony\Component\Console\Formatter\OutputFormatterInterface;
+use Symfony\Component\Console\Output\OutputInterface;
+
+class WebOutput implements OutputInterface
+{
+    public $cleaned = false;
+
+    public function __construct()
+    {
+        ini_set('output_buffering', 'Off');
+    }
+
+    public function write($messages, $newline = false, $options = 0)
+    {
+        if (!$this->cleaned) {
+            //ob_end_flush();
+            $this->cleaned = true;
+        }
+        echo $messages . '<br/>';
+        $this->flush_buffers();
+    }
+
+    public function flush_buffers()
+    {
+        //$result = ob_get_contents();
+        //echo $result;
+        flush();
+    }
+
+    public function writeln($messages, $options = 0)
+    {
+        // TODO: Implement writeln() method.
+    }
+
+    public function setVerbosity($level)
+    {
+        // TODO: Implement setVerbosity() method.
+    }
+
+    public function getVerbosity()
+    {
+        // TODO: Implement getVerbosity() method.
+    }
+
+    public function isQuiet()
+    {
+        // TODO: Implement isQuiet() method.
+    }
+
+    public function isVerbose()
+    {
+        // TODO: Implement isVerbose() method.
+    }
+
+    public function isVeryVerbose()
+    {
+        // TODO: Implement isVeryVerbose() method.
+    }
+
+    public function isDebug()
+    {
+        // TODO: Implement isDebug() method.
+    }
+
+    public function setDecorated($decorated)
+    {
+        // TODO: Implement setDecorated() method.
+    }
+
+    public function isDecorated()
+    {
+        // TODO: Implement isDecorated() method.
+    }
+
+    public function setFormatter(OutputFormatterInterface $formatter)
+    {
+        // TODO: Implement setFormatter() method.
+    }
+
+    public function getFormatter()
+    {
+        // TODO: Implement getFormatter() method.
+    }
+}