[RFC] Add read-only DMI hardware endpoint to Proxmox VE

[Krasimir Rangelov <krasimir.rangelov12@icloud.com>]

Hello Proxmox developers,
> 
> I would like to propose a small, read-only API extension for Proxmox VE: a new endpoint at GET /nodes/{node}/hardware/dmi.
> 
> The endpoint would expose basic DMI hardware identification data from /sys/devices/virtual/dmi/id/ (for example BIOS vendor/version/date, board vendor/name/serial, chassis details, product name/UUID/serial, and system vendor). The implementation would be protected => 1 so it runs via pvedaemon with sufficient privileges to read sysfs directly, while still requiring Sys.Audit on /nodes/{node}.
> 
> My goal is to provide a standard, documented way to retrieve hardware metadata for asset management, inventory tracking, provisioning, CMDB integration, and reporting. I am reading the data directly from sysfs rather than using dmidecode, since sysfs is faster, avoids parsing, and is available on Linux systems exposing DMI.
> 
> I have prepared a sample implementation as a new module PVE/API2/Hardware/DMI.pm, plus registration in PVE/API2/Hardware.pm. I would appreciate feedback on the API shape, permission model, and whether the endpoint belongs in pve-manager or another repository.
> 
> If this sounds acceptable, I can split it into a small patch series and send it to the list.
> 
> Best regards,
> Krasimir Rangelov