feature: move all shadcn related code to src/shared/shadcn

src/routes/Page.svelte

@@ -1,5 +1,5 @@
 <script>
-    import Button from '$lib/components/ui/button/button.svelte';
+    import Button from '$shared/shadcn/ui/button/button.svelte';
 </script>
 
 <h1>Welcome to Svelte + Vite</h1>