move intent an config value into config files

src/Config/StopWordsConfig.php

@@ -0,0 +1,40 @@
+<?php
+
+declare(strict_types=1);
+
+namespace App\Config;
+
+final class StopWordsConfig
+{
+    /**
+     * Retrieval-optimized stop-word list.
+     *
+     * Important:
+     * - keep negations
+     * - keep question words
+     * - keep domain terms
+     * - remove only structural filler words
+     *
+     * @return string[]
+     */
+    public function getStopWords(): array
+    {
+        return [
+            'mit',
+            'der', 'die', 'das',
+            'ein', 'eine', 'einer', 'eines',
+            'den', 'dem', 'des',
+            'und', 'oder', 'aber', 'sowie',
+            'ich', 'du', 'er', 'sie', 'es',
+            'wir', 'ihr',
+            'halt', 'eben', 'auch', 'schon',
+            'noch', 'mal', 'bitte', 'danke',
+            'also', 'nun', 'tja',
+            'dann', 'danach', 'davor',
+            'hier', 'dort',
+            'heute', 'gestern', 'morgen',
+            'könnte', 'kannst', 'kann',
+            'würde', 'würdest', 'würden',
+        ];
+    }
+}