[proto/rqd/rust_rqd/cuebot/rest_gateway/cueadmin/cuegui] Feat(GPU): Production-grade, cross-platform GPU support - vendor-aware scheduling, per-device telemetry, isolation, and docs

[proto/rqd/rust_rqd/cuebot/rest_gateway/cueadmin/cuegui] Feat(GPU): Production-grade, cross-platform GPU support - vendor-aware scheduling, per-device telemetry, isolation, and docs #3985