feat: show recognized plate in live feed + active sessions

Surface the advisory ANPR plate (device_events kind="read", keyed by
session identity — unsigned, prunable, never an access decision) next to
entry/exit events in the live feed and on active-session rows.

Resolved at serialize time (new plate-lookup.ts; prefers an entry read;
one device_events scan per page) like subscriber-name enrichment — the
signed ledger is untouched. Adds plate? to the shared LedgerEvent and to
ActiveSession/SessionLookup; a small amber badge in the UI.

Caveat: a vehicle_entry is signed + pushed over WS before the async ANPR
read lands, so a fresh feed row may show no plate until reload; always
present on active sessions.

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

apps/web/src/lib/i18n/sq.ts

@@ -108,6 +108,7 @@ export const sq = {
     badgeOverstay: "tej afatit",
     badgeOverstayTitle:
       "Sesion i paguar. Klienti nuk doli brënda afatit kohor. Ka filluar një periudhë e re tarifimi.",
+    plateTitle: "Targa e njohur nga kamera (orientuese — nuk është vendim aksesi).",
     // filtra
     filterSearchSessions: "Kërko biletë / abonent / targë…",
     filterSearchFeed: "Kërko event / identitet / targë…",