优化deepmate文本

pages/deepMate/deepMate.vue

@@ -776,7 +776,7 @@ const simulateBotResponse = async (userMessage) => {
   });
 
   // 模拟流式响应
-  let responseText = `我已经收到您的消息: "${userMessage}"。+"${markdown}"  `;
+  let responseText = `我已经收到您的消息: "${userMessage}"。"${markdown}"  `;
   let index = 0;
 
   const botIndex = messages.value.length - 1;