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/lib/i18n/en.ts

@@ -344,6 +344,16 @@ export const en: Catalog = {
     anpr: "Plate recognition (ANPR)",
     anprHint:
       "Enable to scan plates on this camera: the vision service reads the plate from a snapshot and feeds it as a read (advisory only — it never opens a barrier on its own). Requires the vision service running.",
+    testAnpr: "Test ANPR",
+    anprTesting: "Testing ANPR…",
+    testAnprHint:
+      "Takes a live snapshot from this camera and tries to read a plate, reporting the result and the time it took. Point a plate at the camera first.",
+    anprOk: "✓ Read plate {{plate}} — {{confidence}}% confidence, {{ms}} ms",
+    anprLowConfidence: "(low confidence — advisory only)",
+    anprTookMs: "{{ms}} ms",
+    "anprFail.vision-disabled": "Vision service is disabled — enable it (VISION_ENABLED) to test ANPR.",
+    "anprFail.snapshot-failed": "Couldn't take a snapshot from the camera (offline or unreachable).",
+    "anprFail.no-plate": "No plate found in the snapshot.",
     whichBarrier: "Which barrier does this device serve?",
     controller: "Controller",
     choose: "Choose…",