I'm not sure if you've worked with embedded but everything you just described shows up for free when you compile your first hello world with the platform SDK.

I'm not sure if you've worked with embedded but everything you just described shows up for free when you compile your first hello world with the platform SDK. All trivial, solved problems. Take a look at nearly any consumer camera and note that it isn't running linux, or anything like linux. There's a reason RPi isn't used to build actual consumer products. It's a neat toy for tinkering, handy around the shop and home for a bunch of purposes, but it's also making all the wrong tradeoffs for something you can deploy and support at scale. Nothing in the OP use case requires linux, you can do everything cheaper, faster, and FAR more efficiently on an ESP32 or similar.