Expose temperatures via api

Please see my comments added to the ##Feature Request section

Moved from a RPi4 to a RPi5 and now the MQTT integration doesn't work so installed the Nextcloud Integration but it doesn't show the CPU Temperature.

regards
H

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Feature request

Which Nextcloud Version are you currently using: (see administration page)
NextcloudPi v1.55.4 on a RPi5

Is your feature request related to a problem? Please describe.

no - only that I can't see the CPU Temperature easily

Describe the solution you'd like
Report the CPU Temperature on the HAOS Nextcloud Integration

Describe alternatives you've considered
Tried to install the Ironsheep MQTT monitor but an RPi5 uses python in a way that isn't working in this instance.
https://github.com/ironsheep/RPi-Reporter-MQTT2HA-Daemon
Same with
https://github.com/hjelev/rpi-mqtt-monitor

Additional context
Add any other context or screenshots about the feature request here.

No file, test, or API entry point is named in the issue. Start by tracing how the serverinfo app exposes existing system metrics and how the HAOS Nextcloud Integration consumes them, then determine whether CPU temperature is available on the RPi5 environment. Done means the temperature is exposed through the API and verified in the integration without breaking other platforms.