feat(cron): add Edit button and modal for updating cron jobs (#4132)
- Backend: add PATCH /api/cron/{id} handler (handle_api_cron_patch)
using update_shell_job_with_approval with approved=false; validates
job exists (404 on miss), accepts name/schedule/command patch fields
- Router: register PATCH on /api/cron/{id} alongside existing DELETE
- Frontend API: add patchCronJob(id, patch) calling PATCH /api/cron/{id}
- i18n: add cron.edit, cron.edit_modal_title, cron.edit_error,
cron.saving, cron.save keys to all 3 locales (zh, en, tr)
- UI: Edit (Pencil) button in Actions column opens a pre-populated modal
with the job's current name, schedule expression, and command;
submitting PATCHes the job and updates the table row in-place
Co-authored-by: WareWolf-MoonWall <chris.hengge@gmail.com>
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