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>

vendor/composer/autoload_static.php

@@ -0,0 +1,45 @@
+<?php
+
+// autoload_static.php @generated by Composer
+
+namespace Composer\Autoload;
+
+class ComposerStaticInitf0c36081834639cb4575b2393bd0885d
+{
+    public static $prefixLengthsPsr4 = array (
+        'W' => 
+        array (
+            'Websmid\\VatCheck\\' => 17,
+        ),
+        'P' => 
+        array (
+            'PH7\\Eu\\' => 7,
+        ),
+    );
+
+    public static $prefixDirsPsr4 = array (
+        'Websmid\\VatCheck\\' => 
+        array (
+            0 => __DIR__ . '/../..' . '/src',
+        ),
+        'PH7\\Eu\\' => 
+        array (
+            0 => __DIR__ . '/..' . '/ph-7/eu-vat-validator/src',
+        ),
+    );
+
+    public static $classMap = array (
+        'Composer\\InstalledVersions' => __DIR__ . '/..' . '/composer/InstalledVersions.php',
+        'Ws_VatCheck' => __DIR__ . '/../..' . '/ws_vatcheck.php',
+    );
+
+    public static function getInitializer(ClassLoader $loader)
+    {
+        return \Closure::bind(function () use ($loader) {
+            $loader->prefixLengthsPsr4 = ComposerStaticInitf0c36081834639cb4575b2393bd0885d::$prefixLengthsPsr4;
+            $loader->prefixDirsPsr4 = ComposerStaticInitf0c36081834639cb4575b2393bd0885d::$prefixDirsPsr4;
+            $loader->classMap = ComposerStaticInitf0c36081834639cb4575b2393bd0885d::$classMap;
+
+        }, null, ClassLoader::class);
+    }
+}