fix(search): derive facets from container metadata only

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With embedded resources now surfaced by Tika (cover art via TIKA-4801), the
per-meta facet loop let an embedded image overwrite the container's facets:
audio files ended up with a bogus image facet (the cover's dimensions) and a
wiped audio facet. Take audio/image/photo/location facets from the container
entry only; embedded cover dimensions are captured as the preview instead.

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Gitea Version: 1.28.0+dev-477-g8b6ad49a5f