The v1.69.0 caching refactor (f19033e0d) replaced the old Redis-backed
cached request handler with a simpler in-memory handler but dropped
all per-handler cacheDuration values, defaulting everything to 10s.
This caused widgets that previously had short cache durations (e.g.
health-monitoring at 5s, dns-hole at 5s) to refresh much less
frequently since the client polls every 30s.
Restores cacheTtlMs for all affected request handlers to match their
pre-v1.69.0 values. Also adds cacheTtlMs support to
createWidgetRequestHandler which was missing it.
Beszel handlers are intentionally left untouched as they have their
own cache handling.
Fixes#6268
ajnart
b650bffaa8