scrypted: judge stream health by delivered fps not raw drop count

Previous threshold was "log if drops > 25% of target rate". At 500ms
interval (2 fps target) that fired at 0.5+ dropped fps — but a
displayed rate of 1.5 fps is fine, the panel still updates every
~666ms. The warning told the user to "raise frame_interval_ms" when
nothing was actually wrong.

Track sentFrames separately and only warn when delivered rate falls
under 75% of target. Drop rate is now informational context in the
log line, not the trigger.

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