I want to start reading more, and I'd also like to start avoiding screens before I sleep, so I'd like to get an e-ink device that I can use for reading.

I've never owned or looked into ereaders before so I'm not entirely sure what the general capabilities are in this space, but heres a list of things that I consider important:

• Absolutely essential:
  • I need to be able to put my own files (epubs, pdfs, etc) on the device to read without being forced to go through some marketplace installed on the device (if anything I'd prefer there to not be a marketplace on the device at all, or a removable one, as I would never use it). Files don't need to be added remotely, as long as I can connect it to my (Linux) computer with a USB and mount the storage or pop out the SD/microSD to do that then that's sufficient.
  • I need to actually own the device, none of the techno-feudalist bullshit like what plagues the smartphone landscape. I want to be able to remove non-essential components (e.g. marketplace) and it'd be nice if I could also tinker and install third party software freely. If possible I'd prefer a device that's mostly or completely open and FOSS by design, but I'm aware that might be asking too much. As an alternative I would also be willing to hack the device to get it in an open, FOSS state if the process isn't too complicated and it's well documented, it'd be preferable if it was that way by design but as long as I can get there one way or another I'll be content.
• Would very much like to have:
  • In addition to regular books, it'd be nice if I could also read manga. These tend to be zip/rar files containing a series of images, so I'd assume support for reading things formatted in that way is probably less widespread if it exists at all on dedicated ereader devices.
  • Some kind of lighting so the device is usable in the dark. I don't know how this would compare to the blue light from screens (if anyone knows, please share) but I'll certainly want to use it for more than just before I sleep.
  • Some kind of system to add notes as I read might be nice, I was never good at studying and note taking in school so I don't know how much mileage I'd get out of it but in theory it'd definitely be a boon to organize information as I read or add notes to myself to look into things later or whatever.
• Would be nice to have, can live without:
  • The ability to load music onto the device and plug in headphones to listen to music while I read. Bluetooth for audio devices isn't really something I care about, but might be desireable in case I get bluetooth headphones in the future (unlikely). Unimportant if it has built in speakers or not, as long as I can plug in headphones.