fix: 优化告警邮件主题生成逻辑，确保包含自定义标题

features/fm/email.go

@@ -21,10 +21,10 @@ func AlarmEmailForward(alarmData *Alarm) error {
 	if alarmData.AlarmStatus == 1 {
 		alarmStatus = "Active"
 	}
-	subjectTitle := config.GetYamlConfig().Alarm.EmailForward.Title
-	if subjectTitle == "" {
-		severity := alarmData.OrigSeverity
-		subjectTitle = fmt.Sprintf("%s-%s-%s", severity, alarmData.NeName, alarmData.AlarmTitle)
+	subjectTitle := fmt.Sprintf("%s-%s-%s", alarmData.OrigSeverity, alarmData.NeName, alarmData.AlarmTitle)
+	emailForwardTitle := config.GetYamlConfig().Alarm.EmailForward.Title
+	if emailForwardTitle != "" {
+		subjectTitle = fmt.Sprintf("%s-%s", emailForwardTitle, subjectTitle)
 	}
 	message := fmt.Sprintf(`
 	<p>Alarm information</p>