chore: remove legacy workspace and restructure API + modular admin UI

packages/admin/src/ui/Input.tsx

@@ -0,0 +1,10 @@
+import type { InputHTMLAttributes } from "react";
+
+export function Input({ className = "", ...props }: InputHTMLAttributes<HTMLInputElement>) {
+  return (
+    <input
+      className={`w-full rounded-lg border border-slate-200 bg-white px-4 py-2 text-sm shadow-sm transition focus:border-indigo-500 focus:outline-none focus:ring-1 focus:ring-indigo-500 dark:border-slate-700 dark:bg-slate-900 dark:text-slate-100 ${className}`}
+      {...props}
+    />
+  );
+}