Extend telemetry collection to include GPU model, CPU vendor/model, and RAM speed. misc/api.func: enhance detect_gpu to capture GPU_MODEL and default unknown values; add detect_cpu and detect_ram (dmidecode used for RAM speed), export new globals, and include cpu_*/gpu_model/ram_speed in post_to_api and post_update_to_api payloads. misc/data/service.go: add GPUModel/CPUVendor/CPUModel/RAMSpeed fields to TelemetryIn/Out/StatusUpdate, update PBClient mapping, expand allowed enum values to accept "unknown", sanitize and default empty vendor/passthrough fields to "unknown", and validate new cpu_vendor values. Changes maintain backward compatibility by using "unknown" where data is unavailable.
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