feat: enhance event consumption logic and add success reply handling

internal/ai/runtime/graphs/handoff_graph.go

@@ -82,7 +82,7 @@ func (g *HandoffGraph) Run(ctx context.Context, argumentsInJSON string) (string,
 		if err := services.ConversationService.HandoffByAI(g.conversation.ID, g.aiAgent, state.Reason); err != nil {
 			return "", err
 		}
-		return "已为你转接人工客服，请稍候。", nil
+		return g.buildSuccessReply(), nil
 	case ConfirmationDecisionCancel:
 		return CancelHandoffReply, nil
 	default:
@@ -112,6 +112,10 @@ func (g *HandoffGraph) buildConfirmationPrompt(reason string) string {
 	return fmt.Sprintf("我准备为你转接人工客服。\n原因：%s\n请直接回复“确认”或“取消”。", strings.TrimSpace(reason))
 }
 
+func (g *HandoffGraph) buildSuccessReply() string {
+	return "已为你转接人工客服，请稍候。，请稍候。"
+}
+
 func parseHandoffDecision(value string) ConfirmationDecision {
 	return ParseConfirmationDecision(value)
 }

internal/ai/runtime/graphs/handoff_graph_test.go

@@ -29,3 +29,13 @@ func TestHandoffGraphBuildReasonFallback(t *testing.T) {
 		t.Fatalf("unexpected fallback reason: %q", reason)
 	}
 }
+
+func TestHandoffGraphBuildSuccessReply(t *testing.T) {
+	graph := NewHandoffGraph(&models.Conversation{ID: 1}, &models.AIAgent{Name: "AI"})
+
+	got := graph.buildSuccessReply()
+	want := "已为你转接人工客服，请稍候。，请稍候。"
+	if got != want {
+		t.Fatalf("unexpected success reply: %q", got)
+	}
+}