scrypted/script: auto-populate viewport host via mDNS

The host field is now optional in "+ Add Device". The script tries
dns.promises.lookup("viewport-<name>.local") via the OS resolver
(Bonjour on macOS, nss-mdns on Linux, host networking on Docker) on:

- every registerViewport call (plugin start, child instantiation,
  settings change, periodic 5-min refresh),
- right after createDevice so a fresh viewport's host field is
  populated by the time the operator opens its settings page.

On a successful lookup that differs from the stored host, the
resolved IP is written back to the child's storage. POST /config and
POST /frame then use the resolved value.

Falls back gracefully to the operator-entered host (with a one-line
warning if both are empty). A per-viewport "Auto-resolve via mDNS"
toggle (default on) opts out — useful for cross-VLAN setups or hosts
where mDNS doesn't reach.

scrypted/README.md adds a "How mDNS auto-resolve works" section
covering the per-OS resolver requirements and the Docker host-
networking note.

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