The video dashboard's Memory Usage / System Uptime cards were stuck at their
markup defaults — flatten() only fed library + download figures from
/api/video/dashboard, so data-video-stat='memory'/'uptime' never updated.
Now it pulls those two from the SAME /api/system/stats the music dashboard uses
(one machine → identical figures), with an immediate fill on page-shown and a 10s
poll for live parity with music's push loop. Reached over HTTP (not music's
socket), so the video isolation contract holds; the poll cheaply no-ops whenever
the dashboard isn't the visible page.
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