7597c878

Rename StorageKey to RelativeOutputPath

Rename the type and its associated API (RelativeOutputPathFunc,
IdentityPath, NewRelativeOutputPath, MustCreateRelativeOutputPath,
ErrInvalidRelativeOutputPath, Processor.PathFor, ImportMediaParams.DestPath)
to describe what the value is: a backend-relative path joined onto each
backend's root. Also expand the type's doc comment with concrete local
filesystem and S3 examples.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

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