Fix TypeScript error: add optional chaining for object.relationships

Agent-Logs-Url: https://github.com/objectstack-ai/objectui/sessions/e529b8a3-8ab3-4715-9ba6-77fd9fcd68cb

Co-authored-by: hotlong <50353452+hotlong@users.noreply.github.com>

Author: Claude

apps/console/src/components/schema/objectDetailWidgets.tsx

@@ -161,7 +161,7 @@ export function ObjectRelationshipsWidget({ schema }: { schema: ObjectWidgetSche
         </h3>
         {hasRelationships ? (
           <div className="space-y-3">
-            {object.relationships.map((rel, i) => (
+            {object.relationships?.map((rel, i) => (
               <div
                 key={i}
                 className="flex items-start gap-4 p-4 rounded-lg border bg-card hover:bg-accent/50 transition-colors"