Silently overwrite uploads

Photo uploads can silently overwrite existing files because collision checks only consider linked photos and uploads use an unconditional PUT.

This came up from copilot on a solid panes review.

More investigation came up with this
There are two separate problems:

Incorrect collision source
RDF links are being used as a filesystem/resource existence check.

Unsafe write semantics
PUT replaces the resource at the URI by design.

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