fix(openai): restore ws usage window display

backend/internal/service/openai_gateway_service.go

@@ -210,6 +210,7 @@ type OpenAIForwardResult struct {
 	ReasoningEffort *string
 	Stream          bool
 	OpenAIWSMode    bool
+	ResponseHeaders http.Header
 	Duration        time.Duration
 	FirstTokenMs    *int
 }
@@ -3747,6 +3748,15 @@ func (s *OpenAIGatewayService) updateCodexUsageSnapshot(ctx context.Context, acc
 	}()
 }
 
+func (s *OpenAIGatewayService) UpdateCodexUsageSnapshotFromHeaders(ctx context.Context, accountID int64, headers http.Header) {
+	if accountID <= 0 || headers == nil {
+		return
+	}
+	if snapshot := ParseCodexRateLimitHeaders(headers); snapshot != nil {
+		s.updateCodexUsageSnapshot(ctx, accountID, snapshot)
+	}
+}
+
 func getOpenAIReasoningEffortFromReqBody(reqBody map[string]any) (value string, present bool) {
 	if reqBody == nil {
 		return "", false