fix: vehicles data extraction in maintenance + financial pages

Both MaintenancePage and FinancialReportsPage were calling
vehiclesService.getAll() but not extracting res.data property.
Result was vehicles being undefined, causing .map error.

Fixed to match FuelPurchasePage pattern:
  const res = await vehiclesService.getAll()
  return res.data || []

Co-Authored-By: Claude Haiku 4.5 <noreply@anthropic.com>

apps/edr-freight-web/backoffice/src/pages/fleet/FinancialReportsPage.tsx

@@ -36,7 +36,10 @@ export function FinancialReportsPage() {
 
   const { data: vehicles } = useQuery({
     queryKey: QUERY_KEYS.VEHICLES.list(),
-    queryFn: () => vehiclesService.getAll({ limit: 1000 }),
+    queryFn: async () => {
+      const res = await vehiclesService.getAll({ limit: 1000 });
+      return res.data || [];
+    },
   });
 
   const { data: fuelStats } = useQuery({

apps/edr-freight-web/backoffice/src/pages/fleet/MaintenancePage.tsx

@@ -35,7 +35,10 @@ export function MaintenancePage() {
 
   const { data: vehicles } = useQuery({
     queryKey: QUERY_KEYS.VEHICLES.list(),
-    queryFn: () => vehiclesService.getAll({ limit: 1000 }),
+    queryFn: async () => {
+      const res = await vehiclesService.getAll({ limit: 1000 });
+      return res.data || [];
+    },
   });
 
   const { data: upcoming, isLoading } = useQuery({