(liveavatar): add video_quality param

[tinalenguyen]

claude, please port this plugin and PR 🙏

[devin-ai-integration]

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[theomonnom]

Should we also use the Literal here? For better typing?

[theomonnom]

lgtm!

[toubatbrian]

This is an automated Claude Code Routine created by @toubatbrian. Right now it is in experimentation stage.

Skipping port to agents-js.

The liveavatar plugin does not currently exist in livekit/agents-js. It was explicitly listed as a Python-only plugin (no JS counterpart) in the prior automated port at livekit/agents-js#1280, alongside avatario, avatartalk, bithuman, did, keyframe, simli, and tavus.

This PR is a narrow additive diff (~17 lines) against avatar.py / api.py that adds a video_quality parameter. Porting just the diff isn't possible because the base plugin doesn't exist in JS, and spinning up a full JS port of liveavatar from a single parameter-addition PR is out of scope for this routine — it would require porting ~500 lines of plugin code plus primitives the JS runtime may not yet expose (QueueAudioOutput, AudioSegmentEnd, rtc.AudioResampler, on-the-wire websocket protocol, etc.).

If the intent is to stand up a brand-new @livekit/agents-plugin-liveavatar package in agents-js, that's best tracked as its own dedicated task (happy to pick it up if filed as a separate request to this routine). For now, flagging this port as intentionally skipped so it doesn't silently fall through.

cc @toubatbrian @livekit/agent-devs

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