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/modules/carwash/api.ts

@@ -1,4 +1,4 @@
-import type { CarWashPayAt, CarwashOrderView, CarwashSettingsView, Tender } from "@parking/shared";
+import type { CarWashPayAt, CarwashOrderView, CarwashSettingsView, Tender, VehicleClass, VehicleRead } from "@parking/shared";
 import { apiFetch } from "../../api.js";
 
 // The Car Wash module's API client — module-local so apps/web/src/api.ts (the core
@@ -15,14 +15,20 @@ export interface CarwashTicketLookup {
   enteredAt: string | null;
   currency: string | null;
   orders: CarwashOrderView[];
+  /** What the camera saw at entry (advisory) and the category the site mapping
+   *  suggests — pre-selected on the desk; the operator may change it. */
+  vision: VehicleRead | null;
+  suggestedCategoryId: string | null;
 }
 
 export interface CarwashSettingsBody {
-  categories?: { id?: string; name: string; active?: boolean }[];
+  categories?: { id?: string; name: string; active?: boolean; visionClasses?: VehicleClass[] }[];
   services?: { id?: string; name: string; active?: boolean }[];
   prices?: { categoryId: string; serviceId: string; priceMinor: number }[];
   /** Where wash money is taken at this site (site-level; the desk no longer asks). */
   payAt?: CarWashPayAt;
+  /** Confidence floor (0–1) for a vision class to flag a category downgrade. */
+  visionThreshold?: number;
 }
 
 export function fetchCarwashSettings(): Promise<CarwashSettingsView> {