Scheduled cron jobs created in the Tasks panel never tick on a
single-container Docker install because the WebUI doesn't run the
gateway daemon itself. The maintainer's analysis on #2785 spells this
out: the gateway ticks the scheduler every 60s, and without it
'Gateway not configured' just sits there.
The Tasks panel already shows a banner explaining this, but doesn't
give the user anywhere to go. Two small docs-shaped changes:
1. Add a 'Scheduled jobs require a gateway daemon' section to
docs/docker.md under 'What goes wrong' with the two-container
compose command and a verify step. Cross-linked from the existing
short paragraph higher up so both entry points land on the same
fix.
2. Append a 'How to enable scheduled jobs in Docker' link to the
cron panel banner (loadCronGatewayNotice) pointing at the new
docs anchor when the gateway is unconfigured. The banner text
itself is unchanged.
Verified locally by serving the WebUI without a gateway, opening
Tasks, and confirming the banner now shows the new link; clicked it
and confirmed it lands on the new docs section. With the gateway
running the banner stays hidden as before.
Refs #2785