chore(ui): remove unused ROI demo notice

ui/litellm-dashboard/src/components/shared/DemoNotice.tsx

@@ -1,16 +0,0 @@
-import { Info } from "lucide-react";
-import { Button } from "@/components/ui/button";
-
-export function DemoNotice({ onExit }: { onExit?: () => void }) {
-  return (
-    <div className="flex flex-wrap items-center justify-between gap-3 rounded-lg border border-info/20 bg-info/10 px-4 py-3">
-      <p role="status" className="flex items-center gap-2 text-sm font-medium text-info">
-        <Info aria-hidden="true" className="size-4 shrink-0" />
-        You’re viewing demo data
-      </p>
-      <Button variant="outline" size="sm" onClick={onExit}>
-        Exit demo
-      </Button>
-    </div>
-  );
-}