Drawing hazard zones on a blank canvas meant guessing pixel coordinates.
The editor can now pull the camera's most recent snapshot and draw over
what the camera actually sees.
- SnapshotRepository::latestForCamera() (+ Pdo/in-memory impls), ordered by
snapshot_id, not the device-reported occurred_at (a skewed Pi RTC would
otherwise pin 'latest' to a stale frame)
- GET /api/cameras/{camera}/latest-snapshot -> {uuid}; returns only the id,
the bytes still go through SnapshotProxy's session + site-scope check.
Out-of-scope and missing both 404, so a scoped operator cannot probe for
another site's cameras
- ix_events_camera (camera_id, event_id) so the lookup is not a full scan
- '현재 화면 불러오기' button in the zone editor
Tests: PHP 113 pass (4 skipped, 4 new), pytest 174 pass.
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