Method SetImageProcessor

internal/server/server.go:734–736

SetImageProcessor wires the image processor that the upload handler uses to derive thumbnail variants (TASK-878). Optional — without it uploads still succeed but no thumbnails are generated; the download handler's variant fallback path returns the original blob. The capabilities endpoint reflects wh

(p attachments.Processor)

// download handler's variant fallback path returns the original blob.
// The capabilities endpoint reflects whichever processor is wired.
func (s *Server) SetImageProcessor(p attachments.Processor) {
	s.imageProcessor = p
}

// markUploadInFlight increments the in-flight counter for a content
// hash. Returns a release func the caller MUST defer; the release