feat(cron): introduce delivery modes for isolated jobs

- Added support for new delivery modes in cron jobs: `announce`, `deliver`, and `none`.
- Updated documentation to reflect changes in delivery options and usage examples.
- Enhanced the cron job schema to include delivery configuration.
- Refactored related CLI commands and UI components to accommodate the new delivery settings.
- Improved handling of legacy delivery fields for backward compatibility.

This update allows users to choose how output from isolated jobs is delivered, enhancing flexibility in job management.

docs/web/control-ui.md

@@ -79,6 +79,11 @@ you revoke it with `openclaw devices revoke --device <id> --role <role>`. See
 - Logs: live tail of gateway file logs with filter/export (`logs.tail`)
 - Update: run a package/git update + restart (`update.run`) with a restart report
 
+Cron jobs panel notes:
+
+- For isolated jobs, choose a delivery mode: legacy main summary, announce summary, deliver full output, or none.
+- Channel/target fields appear when announce or deliver is selected.
+
 ## Chat behavior
 
 - `chat.send` is **non-blocking**: it acks immediately with `{ runId, status: "started" }` and the response streams via `chat` events.