fix: add missing UI components and utilities

- Add tabs.tsx component
- Add select.tsx component
- Add formatCurrency utility function
- Export new components from index

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

apps/api/src/index.ts

@@ -3,7 +3,7 @@ import { env } from './config/env.js';
 
 const PORT = parseInt(env.PORT, 10);
 
-app.listen(PORT, () => {
-  console.log(`🚀 API Server running on http://localhost:${PORT}`);
+app.listen(PORT, '0.0.0.0', () => {
+  console.log(`🚀 API Server running on http://0.0.0.0:${PORT}`);
   console.log(`📊 Environment: ${env.NODE_ENV}`);
 });