feat: add 4 new WCAG rules and optimize SourceLocator directory traversal

src/Rules/ImageAltRedundant.php

@@ -0,0 +1,52 @@
+<?php
+
+namespace YakNet\AccessibilityConsole\Rules;
+
+use DOMElement;
+use YakNet\AccessibilityConsole\Core\Severity;
+use YakNet\AccessibilityConsole\Core\Violation;
+use YakNet\AccessibilityConsole\Core\WCAGStandard;
+
+class ImageAltRedundant extends AbstractRule
+{
+    public function getId(): string { return 'WCAG_1_1_1_ALT_REDUNDANT'; }
+    public function getDescription(): string { return 'Image alt text should not contain redundant words like "image" or "photo".'; }
+    public function getStandard(): WCAGStandard { return WCAGStandard::A; }
+    public function getSeverity(): Severity { return Severity::WARNING; }
+
+    /** @var array<int, string> */
+    private array $redundantWords = [
+        'resmi', 'görüntüsü', 'fotoğrafı', 'grafiği', 'logosu', 'ikonu',
+        'image of', 'photo of', 'picture of', 'graphic of', 'logo of', 'icon of'
+    ];
+
+    public function check(DOMElement $element): ?Violation
+    {
+        if (strtolower($element->tagName) !== 'img') {
+            return null;
+        }
+
+        if (!$element->hasAttribute('alt')) {
+            return null;
+        }
+
+        $alt = trim($element->getAttribute('alt'));
+        $cleanAlt = strtolower(preg_replace('/\s+/', ' ', $alt) ?? '');
+
+        if ($cleanAlt === '') {
+            return null;
+        }
+
+        foreach ($this->redundantWords as $word) {
+            if (str_starts_with($cleanAlt, $word) || str_contains($cleanAlt, ' ' . $word)) {
+                return $this->createViolation(
+                    $element,
+                    $this->getDescription(),
+                    'Remove redundant phrases like "' . $word . '" from the alt text. Screen readers already announce elements as images.'
+                );
+            }
+        }
+
+        return null;
+    }
+}