[Feature] Add JPEG XR (JXR) support, including HDR/scRGB

I have searched the existing feature requests, both open and closed, to make sure this is not a duplicate request. • Yes The feature Why this would be useful This is not just support for an obscure or legacy image format. NVIDIA HDR screenshots on Windows are stored as JPEG XR (.jxr) files, and many users already have large collections of these screenshots from games. These screenshots are not going to disappear or suddenly become irrelevant. Users may have hundreds or thousands of existing HDR game screenshots, and they naturally want to keep their original files and import them into their photo management system. As long as Windows/NVIDIA HDR screenshot workflows continue to produce JXR files, JPEG XR support will remain a relevant use case for Immich. The lack of JXR support forces users to leave these screenshots outside their Immich library, even though they are legitimate image assets containing valuable HDR information. Native JXR support would allow …