feat: enhance event consumption logic and add success reply handling

internal/services/message_service.go

@@ -514,7 +514,7 @@ func (s *messageService) ValidateConversationSender(conversationID int64, sender
 		if operator == nil {
 			return nil, errorsx.Unauthorized("未登录或登录已过期")
 		}
-		if conversation.Status != enums.IMConversationStatusAIServing {
+		if conversation.Status != enums.IMConversationStatusAIServing && !allowAIMessageOnPendingHandoff(conversation) {
 			return nil, errorsx.Forbidden("当前会话不处于 AI 接待状态")
 		}
 		if conversation.CurrentAssigneeID != 0 {
@@ -530,6 +530,15 @@ func (s *messageService) ValidateConversationSender(conversationID int64, sender
 	return conversation, nil
 }
 
+func allowAIMessageOnPendingHandoff(conversation *models.Conversation) bool {
+	if conversation == nil {
+		return false
+	}
+	return conversation.Status == enums.IMConversationStatusPending &&
+		conversation.HandoffAt != nil &&
+		conversation.CurrentAssigneeID == 0
+}
+
 func suffixFilenameForSummary(filename string) string {
 	filename = strings.TrimSpace(filename)
 	if filename == "" {

internal/services/message_service_test.go

@@ -0,0 +1,29 @@
+package services
+
+import (
+	"testing"
+	"time"
+
+	"cs-agent/internal/models"
+	"cs-agent/internal/pkg/enums"
+)
+
+func TestAllowAIMessageOnPendingHandoff(t *testing.T) {
+	conversation := &models.Conversation{
+		Status:            enums.IMConversationStatusPending,
+		CurrentAssigneeID: 0,
+		HandoffAt:         ptrTime(time.Now()),
+	}
+	if !allowAIMessageOnPendingHandoff(conversation) {
+		t.Fatalf("expected pending handoff conversation to allow ai handoff notice")
+	}
+
+	conversation.Status = enums.IMConversationStatusAIServing
+	if allowAIMessageOnPendingHandoff(conversation) {
+		t.Fatalf("expected ai serving conversation not to use pending handoff allowance")
+	}
+}
+
+func ptrTime(v time.Time) *time.Time {
+	return &v
+}