Nomad changes

docs/snippets/php/plugins/ocr_backend.md

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+```php title="PHP"
+<?php declare(strict_types=1);
+
+use Kreuzberg\Kreuzberg;
+
+class CustomOcrBackend implements OcrBackend {
+    private array $supportedLangs = ["eng", "deu", "fra"];
+
+    public function name(): string {
+        return "custom-ocr";
+    }
+
+    public function version(): string {
+        return "1.0.0";
+    }
+
+    public function initialize(): void {
+        // Load OCR model or initialize resources
+    }
+
+    public function shutdown(): void {
+        // Cleanup OCR resources
+    }
+
+    public function processImage(string $imageBytes, object $config): object {
+        // Process image bytes and return ExtractionResult
+        // This would call your OCR engine (Tesseract, EasyOCR, etc.)
+        return (object)[
+            'content' => 'Extracted text from image',
+            'mime_type' => 'image/png',
+            'metadata' => ['ocr_engine' => 'custom-ocr'],
+            'tables' => [],
+            'detected_languages' => ['eng'],
+        ];
+    }
+
+    public function processImageFile(string $path, object $config): object {
+        // Read file and delegate to processImage
+        $imageBytes = file_get_contents($path);
+        return $this->processImage($imageBytes, $config);
+    }
+
+    public function supportsLanguage(string $lang): bool {
+        return in_array($lang, $this->supportedLangs);
+    }
+
+    public function backendType(): string {
+        return "OCREngine";
+    }
+
+    public function supportedLanguages(): array {
+        return $this->supportedLangs;
+    }
+
+    public function supportsTableDetection(): bool {
+        return true;
+    }
+
+    public function supportsDocumentProcessing(): bool {
+        return false;
+    }
+
+    public function processDocument(string $path, object $config): object {
+        throw new Exception("Document processing not supported");
+    }
+}
+
+// Register the custom OCR backend
+$backend = new CustomOcrBackend();
+Kreuzberg::registerOcrBackend($backend);
+
+echo "Custom OCR backend registered\n";
+```