feat: 更新大模型调用逻辑，直接传递发送者名字以优化用户输入格式

controller/groupAgent/agent.ts

@@ -53,16 +53,13 @@ const agent = async (ctx: Context.Data) => {
     }
   }
 
-  // 获取发送者的名字
-  const userName = historyMentions.get(openId || "") ?? "用户"
-  userInput = `${userName}：${userInput}`
-
   // 调用大模型
   try {
     await updateCard(cardGender.genPendingCard("LLM激情输出中，请稍等..."))
     const llmRes = await llm.invoke(
       "groupAgent",
       {
+        userName: historyMentions.get(openId || "") ?? "用户",
         userInput,
         chatHistory: JSON.stringify(chatHistory),
         time: new Date().toLocaleString("zh-CN", { timeZone: "Asia/Shanghai" }),