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CNC执行 → PipelineExecutionService(返回 LastStepOutputData)
→ CncExecutionService(调用 PushDetectionOverlay)
→ MainViewportService(触发 DetectionOverlayUpdated 事件)
→ ViewportPanelView(订阅事件,调用 DetectionOverlayRenderer)
→ PolygonRoiCanvas.SetDetectionOverlayCanvas(插入叠加层 Canvas)