feat(vision): configurability — SetupWizard ANPR toggle, footer health chip, env docs

Make the vision service genuinely configurable (was env-only).

- SetupWizard: an "ANPR" checkbox on the camera form (writes config.anpr; persisted
  only when on; sq+en) — opt-in is no longer raw JSON.
- DeviceMonitor optionally takes the VisionClient and probes /health each tick, emitting
  a "vision" pseudo-device → a Vision chip (ready/degraded/offline + recognizer) in the
  booth footer when VISION_ENABLED, no chip when off. Widened the DeviceStatus category
  union (server + web) + footer maps + devices.catVision. Verified: ready/fast_alpr when
  up, 0 chips when disabled.
- apps/vision/.env.example (Python service) + a VISION_* block in apps/server/.env.example
  (Node side) + a Configuration section in opencv-anpr-service.md covering all four
  layers and the caveats: the two processes share the VISION_ prefix but need SEPARATE
  .env files; bind /analyze to 127.0.0.1; cache model weights at deploy; an unbound anpr
  camera recognizes but every read is refused.

Build + lint green.

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

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

@@ -65,6 +65,7 @@ export const sq = {
     catReader: "Lexuesi",
     catCamera: "Kamera",
     catPrinter: "Printer",
+    catVision: "Vizioni",
     // Role/direction suffixes for the chip label (e.g. "Lexuesi hyrje").
     role: {
       entry: "hyrje",
@@ -306,6 +307,10 @@ export const sq = {
     entryCooldownHint:
       "Kur nuk ka sensor pranie: shtypjet e përsëritura të butonit shtypen për kaq sekonda pas një bilete. Zgjidhje rezervë (jo garanci) — një abuzues mund ta presë afatin.",
     addRelay: "+ Shto rele",
+    // Camera ANPR opt-in.
+    anpr: "Njohja e targave (ANPR)",
+    anprHint:
+      "Aktivizo që ky aparat të skanojë targat: shërbimi i vizionit lexon targën nga pamja dhe e dërgon si lexim (vetëm këshillues — nuk hap vetë barrierën). Kërkon shërbimin e vizionit aktiv.",
     // Binding picker.
     whichBarrier: "Cilën barrierë shërben kjo pajisje?",
     controller: "Kontrolluesi",