Ability to convert HEIC to JPG

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Is your feature request related to a problem? Please describe.
In an effort to improve auto-upload functionality on iOS, we plan to use the new API for iOS 27+ that allows us to upload photos/videos in the background faster and more reliably.
For this, however, we need to move the conversion of HEIC to JPG from client to server, as the new API does not allow asset modifications.

Describe the solution you'd like
Add the ability for server to convert a newly uploaded HEIC photo to a JPG. The conversion will be an optional toggle on the iOS app, so we can specify conversion with maybe a header field or some other param.

Describe alternatives you've considered
No alternatives.

Additional context
For the current HEIC to JPG conversion on client we use maximum JPG compression quality, so it should be the same on server:

let jpegData = CIContext().jpegRepresentation(
    of: ciImage,
    colorSpace: colorSpace,
    options: [compressionQuality: 1.0]
)

No files or tests are named. Start by tracing server handling for newly uploaded files and checking existing image-conversion support; determine how an optional header or parameter reaches that path. Done means an opted-in HEIC upload produces a JPG at maximum quality without changing other uploads, with coverage for the conversion behavior.