feat(auto): add advanced scheduler cron and run logs

[alexk-dev]

Summary

• add an advanced cron mode to the scheduler API and dashboard so users can create minute-level schedules like every minute or every 5 minutes without losing the existing simple presets
• expose goal, task, and schedule identifiers in the dashboard, chat context, and command responses so schedules can be created and debugged without guessing ids
• add scheduler run history endpoints and a dashboard logs modal that groups persisted session messages by auto run id for per-schedule troubleshooting
• propagate auto scheduler metadata through MDC, agent context, persisted assistant/tool messages, and session detail responses so failures can be traced by run, schedule, goal, task, and conversation
• cover the new scheduler flows with backend tests for advanced cron creation, run history aggregation, session metadata mapping, and auto scheduler context propagation

[sonarqubecloud]

Quality Gate passed

Issues
6 New issues
0 Accepted issues

Measures
0 Security Hotspots
81.2% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud