refactor: split tool-workshop page into tab components (Task 4.1)

- Extract ToolTypesTab, ToolConfigsTab, ConfigFoldersTab from inline page
- Each tab is self-contained with own state, API calls, and forms
- Slim page to 77 lines (tab switcher + composition only)
- Add barrel export for tool-workshop feature components
- Add tsconfig path alias for @/* imports

Quality gates: tsc (pass), eslint (pass)
Refs: repo-restructure Task 4.1

apps/web/src/components/ui/index.ts

@@ -1,3 +1,4 @@
 export { LoadingState } from "./LoadingState";
 export { ErrorState } from "./ErrorState";
 export { StatusBadge } from "./StatusBadge";
+export { ConfirmDialog } from "./ConfirmDialog";