feat(carwash): advisory vehicle category from the entry camera — mapping, pre-select, downgrade flag

The app plumbing for venue-modules.md §"Vehicle category from vision"; the model is the
open half (no bundled recognizer emits body_type yet, so the desk shows nothing until
phase A lands in the vision service).

- Shared: VEHICLE_CLASSES vocabulary, VehicleRead, CARWASH_VISION_THRESHOLD_DEFAULT,
  reason code carwash.categoryDowngrade; settings/order/lookup views carry the read.
- Vision contract: /analyze vehicle.body_type + confidence (service schema); the Node
  client normalises to the vocabulary and drops the rest.
- Record: snapshot.ts stores the read in the plate's device_events row (or its own when
  the plate was unreadable); vehicleForIdentity() resolves it like the plate.
- Car wash: carwash_categories.vision_classes (site mapping "car, sedan → Vetura"),
  carwash_config.vision_threshold (signed config_change when it moves), four vision
  columns on orders — migration 0030. Lookup returns vision + suggestedCategoryId.
- Desk pre-selects the mapped category and shows the read + snapshot thumbnail; Setup
  offers class chips per category and the threshold. Operator decides.
- Flag: a read at/above the threshold whose mapped category prices HIGHER than the chosen
  one signs one `anomaly` (both categories/prices, operator, snapshot) and stores its id on
  the order. Equal/upgrade/unsure/unmapped → nothing. Recorded only, never blocks, no
  reason prompt (user, 2026-09-06).

Tests in carwash.test.ts; wiki venue-modules (As built), opencv-anpr-service, log.

Claude-Session: https://claude.ai/code/session_01FWncR69HgGPuei1dLrW3cU

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

@@ -67,6 +67,18 @@ export const en: Catalog = {
       carwash: "Car wash",
     },
   },
+  vehicleClass: {
+    car: "car",
+    sedan: "sedan",
+    hatchback: "hatchback",
+    suv: "SUV",
+    minivan: "minivan",
+    pickup: "pickup",
+    van: "van",
+    truck: "truck",
+    bus: "bus",
+    motorcycle: "motorcycle",
+  },
   wash: {
     tillTitle: "Wash till",
     tillHint: "Money taken at the bay is recorded on the wash till — open your wash shift first. The booth's shift does not cover it.",
@@ -124,6 +136,12 @@ export const en: Catalog = {
     sponsorship: "Parking discount",
     sponsorshipHint: "What a finished wash takes off the customer's parking fee. Applied automatically when a wash is marked done.",
     sponsorshipLabel: "Car wash",
+    // Vision (advisory): the entry camera's body-type read, mapped to a site category.
+    visionSaw: "Camera saw",
+    visionUnmapped: "not mapped to a category",
+    visionClasses: "Camera classes",
+    visionThreshold: "Camera confidence to flag a downgrade",
+    visionThresholdHint: "When the camera is at least this sure and the operator picks a cheaper category than the one its class maps to, the order is flagged for review. It is never blocked.",
   },
   update: {
     available: "Update available",
@@ -385,6 +403,7 @@ export const en: Catalog = {
     "entry.operatorIssued": "Entry ticket issued by operator {{operator}} (physical button broken)",
     "entry.issue.noPresence": "Operator entry refused — no vehicle detected at the entry",
     "entry.duplicatePlate": "Possible duplicate entry — plate {{plate}} is already inside under ticket {{otherIdentity}}",
+    "carwash.categoryDowngrade": "Wash category downgraded — camera saw {{visionClass}} ({{visionCategory}}), operator {{operator}} chose {{chosenCategory}}",
     "exit.refused.closed": "Exit refused — session already closed",
     "exit.refused.noSession": "Exit refused — unknown ticket",
     "exit.refused.unpaid": "Exit refused — not paid (take payment first)",