[NOTICKET] remove source_hint line

src/api/v1/chat.py

@@ -192,7 +192,6 @@ async def chat_stream(request: ChatRequest, db: AsyncSession = Depends(get_db)):
                         query=search_query,
                         user_id=request.user_id,
                         db=db,
-                        source_hint=intent_result.get("source_hint", "both"),
                     )
                 else:
                     raw_results = await retrieval_task