fix bug LLM

app/main.py

@@ -207,7 +207,10 @@ async def process_message(message_data: Dict[str, Any]):
         hanh_vi_vi_pham = llm_analysis[0].get('hanh_vi_vi_pham')
     else:
         keywords = extract_keywords(message_text, VEHICLE_KEYWORDS)
-        hanh_vi_vi_pham = message_text.replace(keywords, "")
+        hanh_vi_vi_pham = message_text
+        for kw in keywords:
+            hanh_vi_vi_pham = hanh_vi_vi_pham.replace(kw, "")
+        hanh_vi_vi_pham = hanh_vi_vi_pham.strip()
 
     logger.info(f"[DEBUG] Phương tiện: {keywords} - Hành vi: {hanh_vi_vi_pham} - Mục đích: {muc_dich}")