fix(analytics): filter out common file extensions from topic words

Excludes image, video, audio, and document file extensions from the
topic word extraction process to improve the quality of generated
analytics topics.

services/backend/src/modules/analytics/analytics.repository.ts

@@ -361,6 +361,15 @@ export class AnalyticsRepository {
             'mana','cuma','kah','udh','gitu','gini','gtu','gni',
             'mending','wkakak','wakak'
           )
+          AND word NOT LIKE '%.jpg'
+          AND word NOT LIKE '%.jpeg'
+          AND word NOT LIKE '%.png'
+          AND word NOT LIKE '%.gif'
+          AND word NOT LIKE '%.webp'
+          AND word NOT LIKE '%.mp4'
+          AND word NOT LIKE '%.mp3'
+          AND word NOT LIKE '%.pdf'
+          AND word NOT LIKE '%.zip'
           GROUP BY word
           ORDER BY COUNT(*) DESC
           LIMIT 10