chore(capture): better defaults

[Kikobeats]

Note

Medium Risk
Medium risk because it changes how recordings are started/stopped (auto-stop in the extension + new timeout handling) and alters default MP4 codec and constraint behavior, which can affect output compatibility and capture reliability.

Overview
Removes the quality option (and related bitrate presets/exports) from @browserless/capture, simplifying capture configuration and docs/tests accordingly.

Shifts recording lifetime control into the extension by passing duration to START_RECORDING for an auto-stop timer, starting MediaRecorder without a fixed timeslice, and adding a host-side safety timeout while awaiting the websocket recording buffer.

Updates defaults by changing the MP4 default codec to avc1.640028 and no longer forcing a maxFrameRate into inferred/custom video constraints; the benchmark script now takes a raw BITRATE env var instead of QUALITY presets.

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