Add a separate `record` field so a camera can be registered but fully
off, or on but not recording:
- enabled (Вкл): camera on/off. Disabled = no go2rtc stream (no live),
no recording; entry is just stored. build_streams/sync_all/reconcile
skip disabled cameras; live grid shows "камера выключена".
- record (REC): write segments to disk. Recorder runs only when
enabled AND record.
Unified POST /api/cameras/{id}/toggle {enabled?, record?} (replaces the
/record endpoint); go2rtc is touched only when `enabled` changes, so
flipping REC doesn't blip live. Camera table gets Вкл + Запись toggle
columns; add/edit forms get both switches.
load_config migrates the old schema (no `record` key): old `enabled`
meant "record" with live always on -> enabled=True, record=old enabled.
VERSION -> 0.0.126.
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
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