feat(vision): surface the recognized plate in the booth UI

The ANPR plate was saved (device_events kind:"read") but had no UI. Extend
GET /api/snapshots/by-identity/:identity to also return plates[] (plate, confidence,
region, direction, snapshotId, at) for that session, and render each as a cyan
"Plate: AA558EE 100%" chip in the SnapshotStrip — so it shows in both the booth
event-detail modal and the pay modal, beside the evidence photo, no separate screen.
Deduped by plate+direction; session:read gated; i18n sq+en.

Verified: by-identity returns plates[] for a seeded read (200, AA558EE 0.999 Albania
entry). Build + lint green.

Claude-Session: https://claude.ai/code/session_01Xcm6ikLgGoCxxHrxtjkk5V

wiki/entities/opencv-anpr-service.md

@@ -186,6 +186,11 @@ records nothing, a vision failure never delays or changes the open, and the plat
 access decision (the flow already decided). *Verified end-to-end:* a simulated entry snapshot on an
 `anpr` camera → stored the snapshot for the session AND recorded `{identity:"TICKET-…", plate:"AA558EE",
 confidence:0.999, region:"Albania", snapshotId:…}`.
+
+**Viewing it:** `GET /api/snapshots/by-identity/:identity` now also returns `plates[]` (the
+`kind:"read"` reads for that session), and the **`SnapshotStrip`** renders each as a cyan
+"Plate: AA558EE 100%" chip above the images — so the recognized plate shows in the **booth
+event-detail modal AND the pay modal** beside the evidence photo, with no separate screen.
 (3) **field-accuracy** unknown — re-benchmark/tune
 the threshold on real on-site captures (angle/night/dirt). (4) the **weight-provenance** check (open).
 **Bottom line: consume it as a gated advisory identity record off the entry/exit snapshot — not as sole