Jellyfin has no DirectStreamUrl field — MediaSourceInfo carries only
TranscodingUrl, and a DirectPlay decision returns no URL at all, leaving the
client to build /Videos/{id}/stream itself. The branch reading
DirectStreamUrl was therefore dead against every Jellyfin version, along with
the 'DirectStream' play method and the doc comment promising both.
The static URL also dropped MediaSourceId whenever the item had a single
source whose Id equalled the item id — an ordinary episode. The streaming
endpoint resolves a blank MediaSourceId to its own first sorted source
(VideoFile first, then widest video), so the omission silently streamed a
different file as soon as the item gained an alternate version. Forward the
id the negotiation settled on, as jellyfin-web, Findroid, and Streamyfin all
do unconditionally.
Every "pinned" fixture used a source id that differed from the item id, so no
test exercised the shape that dropped the param; add one that does.
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