scrypted: per-viewport frame interval + trigger picker + live status; drop mDNS auto-resolve

- Move "frame push interval" from the parent's global setting to a
  per-viewport child setting (different cameras want different rates).
  Clamped to ≥33 ms (~30 fps max). Default still 1000 ms (1 fps).
- New "Wake triggers" multi-select on each viewport: doorbell, motion,
  person. Default = all three. Clear all of them for tap-only mode.
  handleCameraEvent now gates by this set; clearing it cleanly turns a
  viewport into a tap-only display with no auto-wake.
- Add a "Status (live)" group at the bottom of each viewport's Settings
  page that fetches /state + /config in parallel (1.5 s timeout) and
  surfaces every field — name, mac, ip, awake/asleep, configured,
  uptime, frame + error counters, resolution, free heap/psram, firmware
  version, registered scrypted URL. Offline devices say so cleanly.
- Drop mDNS auto-resolve: no more lookupMdns / refreshHostFromMdns,
  no per-viewport "auto-resolve via mDNS" toggle, no `dns` require.
  The host field is just an operator-set string now. The README
  documents the manual lookup commands (dns-sd, avahi-resolve) so
  finding the device IP stays a one-liner.
- Parent's Settings page is now informational-only (viewport count +
  callback base URL); per-viewport tuning lives on each child.

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