feat: Implement useRealtimeSubscriptions hook

src/lib/moderation/index.ts

@@ -55,3 +55,12 @@ export {
 } from './sorting';
 
 export type { SortConfig, SortField, SortDirection } from '@/types/moderation';
+
+// Realtime subscription utilities
+export {
+  matchesEntityFilter,
+  matchesStatusFilter,
+  hasItemChanged,
+  extractChangedFields,
+  buildModerationItem,
+} from './realtime';