Juan Denis dca5c3af67 Add remote cron management (agent, API, UI) ...

Introduce remote cron management across agent, backend and frontend.

- Agent: add a cron.Manager to agent, register handlers (cron:status,list,add,remove,toggle) and implement thin JSON handlers. Add agent/pkg/protocol message constants.
- Cron package: new platform-agnostic interface with Linux implementation (crontab-driven) and non-Linux stub. Includes content-based stable IDs, validation, list/add/remove/toggle and human-friendly schedule descriptions.
- Backend: expose /servers/<id>/cron/* endpoints and add RemoteCronService to proxy requests to agents via agent_registry, mapping agent responses to HTTP codes.
- Frontend: enhance Tabs component with overflow "More" popover; add API calls for remote cron ops; wire a Cron tab in ServerDetail (guarded by server.capabilities.cron) with UI for listing, adding, toggling and removing jobs; add Cron UI in Git page by switching to the new Tabs component.

Notes: cron functionality is Linux-only; non-Linux agents return an explicit unsupported status. Validation prevents unsafe shell operators and requires absolute command paths.

2026-05-01 01:54:17 -04:00

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protocol

Add remote cron management (agent, API, UI)

2026-05-01 01:54:17 -04:00