feat(scheduled-jobs): site scheduled jobs resource

[fbarrento]

Parent

#32

What to build

Site-scoped scheduled jobs: server($id)->site($s)->scheduledJobs() list/get/create/delete + output. Reuses the ScheduledJob DTO from the server-scope slice.

Acceptance criteria

• Requests: GET/POST /sites/{site}/scheduled-jobs, GET/DELETE .../{job}, GET .../{job}/output
• Site-scoped scheduled-jobs resource wired on SiteResource
• Reuses ScheduledJob/CreateScheduledJobData DTOs where shapes match
• Live-recorded fixtures; 100% coverage

Blocked by

None - can start immediately