#composables

Architect a data fetching layer with Nuxt 3 composables. Structure: 1. useFetch with key-based caching. 2. useAsyncData for complex queries. 3. Custom composable useApiClient. 4. Global error handling middleware. 5. Loading states with useLoadingIndicator. 6. Optimistic updates pattern. 7. Request deduplication. 8. Stale-while-revalidate strategy. Integrate Pinia for client-side state and implement automatic retries with exponential backoff.