Initial commit: Rampart v0.2.0

Multi-layer DDoS protection for Minecraft servers.

- rampart-core: Edge node with XDP/eBPF + Rust L7 filtering
- rampart-manager: REST API with JWT auth, Redis sync
- rampart-cli: CLI tool for operators
- velocity-plugin: Domain check, HMAC verify, server registry, load balancer
- paper-plugin: Auto-registration, heartbeat, HMAC verify
- dashboard: React + Vite web UI for management

dashboard/src/components/Layout.tsx

@@ -0,0 +1,53 @@
+import { useState } from 'react'
+import { logout } from '../api'
+import Servers from './Servers'
+import Blacklist from './Blacklist'
+import Nodes from './Nodes'
+
+type Page = 'servers' | 'blacklist' | 'nodes'
+
+const navItems: { key: Page; label: string }[] = [
+  { key: 'servers', label: 'Servers' },
+  { key: 'blacklist', label: 'Blacklist' },
+  { key: 'nodes', label: 'Nodes' },
+]
+
+function Layout() {
+  const [page, setPage] = useState<Page>('servers')
+
+  function renderPage() {
+    switch (page) {
+      case 'servers':
+        return <Servers />
+      case 'blacklist':
+        return <Blacklist />
+      case 'nodes':
+        return <Nodes />
+    }
+  }
+
+  return (
+    <div className="layout">
+      <aside className="sidebar">
+        <h2>Rampart Manager</h2>
+        <nav>
+          {navItems.map((item) => (
+            <button
+              key={item.key}
+              className={page === item.key ? 'active' : ''}
+              onClick={() => setPage(item.key)}
+            >
+              {item.label}
+            </button>
+          ))}
+        </nav>
+        <button className="logout-btn" onClick={logout}>
+          Logout
+        </button>
+      </aside>
+      <main className="main-content">{renderPage()}</main>
+    </div>
+  )
+}
+
+export default Layout