remove direct chnuk search. only vector search

src/Knowledge/QueryCleaner.php

@@ -0,0 +1,39 @@
+<?php
+
+declare(strict_types=1);
+
+namespace App\Knowledge;
+
+final readonly class QueryCleaner
+{
+    public function __construct(
+        private StopWords $stopWords
+    ) {
+    }
+
+    public function clean(string $query): string
+    {
+        $query = mb_strtolower($query);
+        $query = preg_replace('/[^\p{L}\p{N}\s]/u', ' ', $query);
+        $query = preg_replace('/\s+/u', ' ', $query);
+        $query = trim($query);
+
+        if ($query === '') {
+            return '';
+        }
+
+        $tokens = explode(' ', $query);
+        $stopWords = $this->stopWords->getStopWords(); // <-- wichtig: nutzt deine Klasse
+
+        $filtered = array_filter(
+            $tokens,
+            function (string $word) use ($stopWords): bool {
+                return $word !== ''
+                    && mb_strlen($word) > 2
+                    && !in_array($word, $stopWords, true);
+            }
+        );
+
+        return implode(' ', $filtered);
+    }
+}