feat: scaffold react dashboard

frontend/src/App.tsx

@@ -0,0 +1,8 @@
+export default function App() {
+  return (
+    <div className="app">
+      <h1>Discord Moderation Dashboard</h1>
+      <p>React/Vite scaffold - dashboard components coming soon</p>
+    </div>
+  );
+}

frontend/src/main.tsx

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+import React from "react";
+import ReactDOM from "react-dom/client";
+import App from "./App";
+import "./styles.css";
+
+ReactDOM.createRoot(document.getElementById("root")!).render(
+  <React.StrictMode>
+    <App />
+  </React.StrictMode>
+);

frontend/src/styles.css

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+* {
+  margin: 0;
+  padding: 0;
+  box-sizing: border-box;
+}
+
+body {
+  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "Roboto", "Oxygen",
+    "Ubuntu", "Cantarell", "Fira Sans", "Droid Sans", "Helvetica Neue",
+    sans-serif;
+  -webkit-font-smoothing: antialiased;
+  -moz-osx-font-smoothing: grayscale;
+  background-color: #1e1e1e;
+  color: #e0e0e0;
+}
+
+.app {
+  padding: 2rem;
+  max-width: 1200px;
+  margin: 0 auto;
+}
+
+h1 {
+  margin-bottom: 1rem;
+  color: #ffffff;
+}
+
+p {
+  color: #b0b0b0;
+}