domain: use public AsyncLocalStorage API

Use require('async_hooks').AsyncLocalStorage instead of directly
importing internal modules. This allows proper auto-selection of
the ALS implementation based on --async-context-frame flag.

Author: mcollina

lib/domain.js

@@ -50,13 +50,7 @@ let domainStorage;
 
 function initDomainStorage() {
   if (domainStorage === undefined) {
-    // Import AsyncContextFrame and trigger enabled check to ensure prototype swap
-    const AsyncContextFrame = require('internal/async_context_frame');
-    // eslint-disable-next-line no-unused-expressions
-    AsyncContextFrame.enabled;  // Triggers prototype swap from inactive to active
-
-    // Import the async_context_frame-based ALS directly to avoid circular deps
-    const AsyncLocalStorage = require('internal/async_local_storage/async_context_frame');
+    const { AsyncLocalStorage } = require('async_hooks');
 
     // Single AsyncLocalStorage instance for all domain context
     // Store structure: { domain: Domain | null, stack: Domain[] }