The v1.69.0 caching refactor replaced Redis pub/sub push with a global
30s client-side refetchInterval. This caused fast-refresh widgets like
health-monitoring (Dashdot, 5s) to only update every 30s.
Adds refetchIntervalSeconds field to WidgetDefinition. Each widget
declares its own refresh rate alongside its other config. The TRPC
provider iterates all widget definitions and calls setQueryDefaults
with the widget's queryKey (or auto-derived from widget kind).
Widgets whose kind doesn't match their tRPC path set queryKey
explicitly (e.g. dnsHoleSummary -> widget.dnsHole, systemResources ->
widget.healthMonitoring). Beszel already does this for cache sharing.
Removed inline refetchInterval from docker widget component since it's
now on the definition.
Fixes#6268
ajnart
789e71096e