scrypted: user-controllable JPEG quality (1–31) in the viewport Settings

Adds a "JPEG quality" field under Display alongside frame_interval_ms,
brightness, etc. ffmpeg -q:v range 1..31 — 1 = highest quality + biggest
JPEG (~140KB at panel-native), higher numbers = smaller + lossier.

Plumbed through both the live-stream encoder and the snapshot one-shot
encoder. Reads from viewport storage; defaults to 1 if unset; clamps
to [1, 31] on read so an out-of-range input from the UI doesn't crash
ffmpeg.

Changing the value triggers the existing onBindingChanged debounce
which already restarts the live stream — picks up the new quality
within ~300ms of Save.

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