Equipment monitoring camera for A1 mini livestream (standalone, separate from toolhead camera)

[sgbaird]

The built-in camera on the A1 mini doesn't support streaming directly (see below), so in addition to the "toolhead camera" from #158, we'll likely want to have a separate monitoring camera that lets people see the device in motion to create the "feeling of control remote hardware". This will be the same as any other setup described in #11. Might seem a bit redundant given there's already a toolhead camera and the built-in A1 mini camera, but I think it will enhance the experience to be able to observe the full system operating in response to commands, and possibly for troubleshooting too.

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Some resources related to the Bambu Lab built-in camera / A1 Mini streaming being unsupported:

• https://wiki.bambulab.com/en/software/bambu-studio/virtual-camera
• RTSP Feed for printer cameras  bambulab/BambuStudio#1536 (comment)
  (someone got A1 mini working, but it's not stable / requires restarts)
• https://github.com/synman/webcamd | https://github.com/synman/bambu-go2rtc
  both found via reddit

Maybe webcamd from above would work, but seems like it could be more work than its worth compared with replicating the Pi Zero 2W setup.

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@Jonathan-Woo could you also get one of these cameras set up, mounted, and pointing at the A1 mini? (secondary priority to the image capture task mentioned in #144)