test(vehicles): add missing redis mock methods exposed by perf(vehicles) commit

c4f6cc1 added this.redis.exists/setNx/incr/expire calls to vehicles.service
(dedup lock + circuit breaker) but vehicles.service.spec.ts redisService
mock was not updated. Result: 1 failing test broke pnpm test, which broke
Fusion merger's in-merge build verification on every subsequent task.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

apps/api/src/vehicles/vehicles.service.spec.ts

@@ -72,6 +72,10 @@ function createService(dbOrOverrides: any = {}) {
     set: vi.fn().mockResolvedValue(undefined),
     setJson: vi.fn().mockResolvedValue(undefined),
     del: vi.fn().mockResolvedValue(undefined),
+    exists: vi.fn().mockResolvedValue(false),
+    setNx: vi.fn().mockResolvedValue(true),
+    incr: vi.fn().mockResolvedValue(1),
+    expire: vi.fn().mockResolvedValue(undefined),
   };
 
   const partsCatalogsService = {