scrypted: log the exact ffmpeg filter chain on stream start

Triage signal for the persistent "expected 800x480, got 480x800"
dimension mismatch. The error has survived two filter rewrites; logs
on the user's side still reference old script.js line numbers, which
suggests the Scrypted Script editor isn't picking up re-pasted code.

Emit the orientation + panel dims + actual `-vf` string once per
stream start. If the log shows up, we know the latest code is live
and the problem is the filter; if it doesn't, the script never
updated.

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