feat(setup): "Test ANPR" probe on ANPR-enabled cameras

Adds a bottom-of-modal "Test ANPR" button (shown only when a camera's
Plate recognition opt-in is checked) that captures a live snapshot off
the camera and runs it through the vision service, reporting the plate
read + confidence + elapsed time, or which stage failed.

- New POST /api/setup/test-anpr: builds the camera from the unsaved
  config (no DB write/device change, like /test), captures a snapshot,
  runs vision.analyze. Fail-soft like the runtime path (snapshot.ts):
  camera/vision failures are reported results, never a 500.
- Thread the existing VisionClient into setupRoutes; add an isCamera()
  type guard to @parking/devices.
- Web: testAnpr() client + AnprTestResult; button, hint, result line.
- i18n keys in sq + en (Catalog parity).

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

apps/web/src/api.ts

@@ -280,6 +280,34 @@ export function testDevice(driverId: string, config: DeviceConfig): Promise<Test
   });
 }
 
+/** Result of an end-to-end ANPR probe on a camera: snapshot → vision analyze. */
+export type AnprTestResult =
+  | {
+      ok: true;
+      plate: string;
+      confidence: number;
+      region: string | null;
+      lowConfidence: boolean;
+      modelVersion: string;
+      tookMs: number;
+    }
+  | {
+      ok: false;
+      /** vision-disabled | snapshot-failed | no-plate */
+      reason: string;
+      detail?: string;
+      tookMs?: number;
+    };
+
+/** Take a live snapshot off the camera and run ANPR on it — without saving. Reports
+ *  whether a plate was extracted, the read, and how long it took. */
+export function testAnpr(driverId: string, config: DeviceConfig): Promise<AnprTestResult> {
+  return apiFetch<AnprTestResult>("/api/setup/test-anpr", {
+    method: "POST",
+    body: JSON.stringify({ driverId, config }),
+  });
+}
+
 export interface BackendIpCandidate {
   ip: string;
   iface: string;