Sync upstream - v26/v30 (2026-02-18)#99

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raiden-staging wants to merge 8 commits intokernel:mainfrom

raiden-staging:livestream@rev2

Commits on Dec 1, 2025

[livestream] add rtmp streaming api: start, stop, list endpoints and schemas
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[livestream] add stream package with ffmpeg-based streamer, manager, and interfaces
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[livestream] add internal rtmp/rtmps server implementation
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[livestream] add streaming api and rtmp/ffmpeg integration
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[livestream] add mock streamer, mock rtmp server and newApiServiceForTest; refactor api tests to use unified stream setup
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[livestream] add streaming api support, client methods and tests
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[livestream] use oapi stream mode enum; stop using request host for playback urls; add rtmp config defaults and tidy struct field formatting
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[livestream] api tests: use oapi mode constants and fix err shadowing
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