add a raw (no sdk) UI

examples/simple-server/ui-raw.html

@@ -0,0 +1,12 @@
+<!DOCTYPE html>
+<html lang="en">
+<head>
+    <meta charset="UTF-8">
+    <meta name="viewport" content="width=device-width, initial-scale=1.0">
+    <title>MCP UI Client (Vanilla)</title>
+</head>
+<body>
+    <div id="root"></div>
+    <script type="module" src="/src/ui-raw.ts"></script>
+</body>
+</html>