Adding an application meant typing an image FILENAME and trusting someone had
dropped the file into the frontend's own directory by hand, and typing an
install path from memory. Both are uploads now, following the model-image trio
that models and part photos already use.
The two differ deliberately. The image is public, because application tiles
render before anything is authenticated. The installer is not: it is licensed
vendor software, an open URL would publish it to anything that can reach the
site, and it is always sent as an attachment rather than rendered.
Installers are capped at 500MB and the size is measured by seeking the stream
rather than trusting Content-Length, which a chunked upload does not send and a
client can understate. Anything larger belongs on the share, and the error says
so rather than just refusing.
Files are chosen before a new application exists, so they are held and uploaded
once there is an id to attach them to. A failed upload leaves the saved record
alone and reports, rather than losing what saved fine.
Removing an installer only clears installpath when it pointed at the upload - a
share path was typed by a person and is not ours to wipe. The detail page reads
both shapes, since entries from the classic site hold a bare filename that is
still served from /images/applications/.
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