feat: add domains, ideas, layouts, widgets API modules

- Add DomainsModule with full CRUD, search, and activity logging
- Add IdeasModule with quick capture endpoint
- Add LayoutsModule for user dashboard layouts
- Add WidgetsModule for widget definitions (read-only)
- Update ActivityService with domain/idea logging methods
- Register all new modules in AppModule

apps/web/src/lib/hooks/index.ts

@@ -0,0 +1,5 @@
+/**
+ * Custom hooks
+ */
+
+export { useLayout, useWorkspaceId } from "./useLayout";