refactor: Keep addTool as deprecated alias of addActor

The internals export was renamed addTool -> addActor. apify-mcp-server-internal
still imports addTool from a pinned published version, so re-export addActor as
addTool to keep that consumer building. Decouples the two repos' merges; remove
the alias once internal migrates off addTool.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01YEYUpGUBagZi4m14YbyJua

Author: claude

src/index_internals.ts

@@ -38,6 +38,10 @@ export {
     defaults,
     getDefaultTools,
     addActor,
+    /**
+     * @deprecated Use `addActor` instead. Kept for the apify-mcp-server-internal migration; remove once it no longer imports `addTool`.
+     */
+    addActor as addTool,
     getCategoryTools,
     toolCategoriesEnabledByDefault,
     type ActorStore,