Merge branch 'feature/deepseek_rag_2.0' into debug

utils/ws/session_manager.go

@@ -145,6 +145,7 @@ func (manager *ConnectionManager) HandleMessage(userID int, sessionID string, me
 		case <-closeChan:
 			if emptyContent {
 				_ = session.Conn.WriteMessage(websocket.TextMessage, []byte("<think></think>"))
+				_ = session.Conn.WriteMessage(websocket.TextMessage, []byte("暂时找不到答案"))
 			}
 			_ = session.Conn.WriteMessage(websocket.TextMessage, []byte("<EOF/>"))
 			return nil