Adds a third way to push a clip to a speaker, surfaced by @dagrider in
#517: POST SetAVTransportURI + Play to the speaker's UPnP MediaRenderer
control endpoint (port 8091). Unlike /speaker play_info it needs no
app_key and no DNS interception, so it works on a plain LAN; the
trade-off is it switches the speaker to the UPNP source and replaces the
current playback (no duck-and-resume).
- pkg/client: SetAVTransportURI, AVTransportPlay, PlayURLViaUPnP (+ the
:8091 control-URL derivation and SOAP plumbing), with tests.
- cmd/soundtouch-cli: `speaker url-upnp --url <url>`.
- docs: document the UPnP/AVTransport option under POST /speaker.
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
Tobias GesellchenandClaude Opus 4.8
a54204c1d0