Release GPU resources after startup encoder probe

[Spencer0187]

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Feature Request

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Sunshine seems to keep a fairly significant amount of VRAM allocated even while completely idle.

On my Fedora/NVIDIA system, immediately after a fresh reboot and before connecting with Moonlight, nvidia-smi reports about 230 MiB of VRAM used by Sunshine. GPU utilization is 0%.

From the logs it looks like this allocation appears when Sunshine tests NVENC/H.264/HEVC/AV1 during its startup encoder probe.

Because Sunshine apparently probes the encoder again when starting a stream anyway, could the startup probe either:

A. Release its GPU/CUDA/NVENC resources completely after capability detection, keeping only the capability results.
B. Just not be probed until the first client needs those capabilities?

230 MiB isn't a huge deal on my 16 GB GPU, but it seems unnecessary for an idle service that may not stream anything for hours.