cameras: surface per-camera REC (record-to-disk) toggle
`enabled` already gated recording only (go2rtc/live work regardless), but
it was a buried "Вкл" checkbox. Make it an explicit REC control:
- New "Запись" column with an inline REC switch in each camera row.
- Relabel the add/edit form toggle "Вкл" -> "REC" + tooltip.
- New POST /api/cameras/{id}/record {enabled} that flips recording through
the supervisor only (no go2rtc re-sync, so live view doesn't blip).
Off = view-only (live via go2rtc); on = record segments to disk.
VERSION -> 0.0.124.
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
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