Add Payload Feature Flags plugin with custom endpoints and configurations

src/exports/client.ts

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+export { BeforeDashboardClient } from '../components/BeforeDashboardClient.js'

src/exports/rsc.ts

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+export { BeforeDashboardServer } from '../components/BeforeDashboardServer.js'
+
+// Server-side hooks for React Server Components
+export {
+  getFeatureFlag,
+  isFeatureEnabled,
+  getAllFeatureFlags,
+  isUserInRollout,
+  getUserVariant,
+  getFeatureFlagsByTag,
+  type FeatureFlag,
+} from '../hooks/server.js'