Initial commit: restructure to flat layout with ui/ and web/ at root

vite-theme-plugin.ts

@@ -0,0 +1,8 @@
+import type { Plugin } from 'vite';
+
+export function themeStoragePlugin(): Plugin {
+  return {
+    name: 'theme-storage',
+    // Plugin retained for compatibility but no longer handles custom themes
+  };
+}