RF-DETR, YOLO26 support + Streaming fixes + Update fixes

New

• 3.2.19 Support RF-DETR and YOLO26 model architectures and remove deprecated legacy model format handling.
• 3.2.19 Replace the watchtower container with native container-image update logic in the gateway manager's update command.

Fixed

• 3.2.19 Fix intermittent RTSP stream start hang on dGPU where a deployment times out to start.
• 3.2.19 Fix Transform node failing to start the pipeline when no transformation properties are configured.