* feat(stream): add ClientInfo.ForceFormat for browser-aware forced format
Restricts the client to a forced transcoding format and suppresses direct
play, but only when the client declares it supports that format. Part of #5583.
* fix(transcoding): honor player forced format on getTranscodeDecision
When the WebUI player has a forced transcoding format configured and the
browser declares it can play that format, transcode to it (suppressing
direct play). Fall back to normal negotiation with a warning when the
format is unsupported. The MaxBitRate cap still applies on top. Fixes#5583.
* test(e2e): cover player forced format on getTranscodeDecision
Forced format honored when the client supports it, falls back to negotiation
otherwise, and the MaxBitRate cap still applies on top. Part of #5583.
* feat(ui): remove obsolete 'format ignored' helper text on player form
The web player now honors the forced transcoding format, so the caveat added
in #5611 no longer applies. Reverts the Transcoding field to a plain selector.
Part of #5583.
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