refactor: optimize codebase encoding

telegram/agent/agent.go

@@ -273,7 +273,7 @@ func (a *Agent) Run(userMessage string, onChunk func(string)) string {
 
 	// Safety: max iterations reached.
 	logger.Warnf("Agent: max iterations (%d) reached for message: %q", maxIterations, userMessage)
-	reply := "操作已完成，请检查您的账户查看最新状态。"
+	reply := "Operation completed. Please check your account for the latest status. / 操作已完成，请检查您的账户查看最新状态。"
 	a.memory.Add("user", userMessage)
 	a.memory.Add("assistant", reply)
 	return reply

telegram/agent/manager.go

@@ -45,7 +45,7 @@ func (m *Manager) Run(chatID int64, userMessage string, onChunk func(string)) st
 	case lane <- struct{}{}:
 	case <-time.After(60 * time.Second):
 		logger.Warnf("Agent: lane wait timeout for chat %d — previous message still processing", chatID)
-		return "上一条消息仍在处理中，请稍等片刻后再试。"
+		return "Previous message is still being processed. Please wait a moment and try again. / 上一条消息仍在处理中，请稍等片刻后再试。"
 	}
 	defer func() { <-lane }()
 	return a.Run(userMessage, onChunk)