scrypted: drop substream picker, hardcode best-resolution + skip low-res

Reverts the per-viewport "Camera substream" UI added in 6d74d02 —
having a knob the user has to find and tune is the wrong shape. The
goal is "best quality, highest fps that's actually achievable" and
that's a deterministic walk, not a user choice.

New walk: medium-resolution → local → remote → camera-default.

Explicitly NOT in the list:
- low-resolution: the camera's preview substream, capped at the
  ~5-8 fps that's been bottlenecking us.
- remote-recorder: has the camera's ~10s prebuffer baked in (we'd
  display the past rather than the present).

Wire cost is unchanged: every input resolution is re-encoded to
panel-native 800x480 mjpeg q:v 1 before going to the device. The
only tradeoff for picking the main stream is Scrypted-side ffmpeg
CPU, which is plentiful. Throughput to the firmware is the same;
upstream camera fps is what changes (5fps → 15-30fps typical).

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