Adds pause/resume support for scheduled prompts.
Backend:
- New paused_at_unix column on scheduled_prompts table (added via
ALTER TABLE migration so existing databases are upgraded on first
start). The due-rows index is dropped and recreated to also exclude
paused rows so the worker never fires them while paused.
- Worker's due() query gains AND paused_at_unix IS NULL filter.
- New pause(id) and resume(id) methods on ScheduledPrompts; both are
idempotent and refuse cancelled rows.
- New POST /api/schedules/{id}/pause and /api/schedules/{id}/resume
dashboard endpoints (operator-direct, no approval gate). Both emit
a schedules snapshot on success so the tab updates live.
- WireSchedule gains paused_at_unix: Option<i64> so the frontend can
render the state without an extra fetch.
Frontend:
- Paused rows render with a distinct row class + muted opacity.
- The next-fire cell shows a yellow pause glyph + tooltip with the
paused-since timestamp and the would-have-fired time.
- Actions column: pause/resume toggle button (⏸/▶) beside fire/edit/cancel.
Fire-now is disabled while paused (resume first).
- Sort order: active → paused → cancelled (paused slot keeps schedules
visible without mixing them into the active top section).
- pauseSchedule() / resumeSchedule() async functions POST to the new
endpoints and refresh the table on success.
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