Server Cache React

## Per-Request Deduplication with React.cache() Use `React.cache()` for server-side request deduplication. Authentication and database queries benefit most. **Usage:** ```typescript import { cache } from 'react' export const getCurrentUser = cache(async () => { const session = await auth() if (!session?.user?.id) return null return await db.user.findUnique({ where: { id: session.user.id } }) }) ``` Within a single request, multiple calls to `getCurrentUser()` execute the query only once.