chore: initial project scaffold with admin web, backend, desktop client, and deployment setup

Add monorepo structure for NexaVPN WireGuard control plane including:
- .gitignore for node_modules, build artifacts, and environment files
- README with project overview, monorepo layout, and quick start guide
- Admin web UI with React, Vite, TypeScript, and nginx reverse proxy
- API client with type definitions for users, devices, policies, gateways, and audit logs
- Admin pages for dashboard, users, devices, policies, g

admin-web/src/main.tsx

@@ -0,0 +1,19 @@
+import React from "react";
+import ReactDOM from "react-dom/client";
+import { QueryClient, QueryClientProvider } from "@tanstack/react-query";
+import { BrowserRouter } from "react-router-dom";
+
+import { App } from "./app/App";
+import "./styles/global.css";
+
+const client = new QueryClient();
+
+ReactDOM.createRoot(document.getElementById("root")!).render(
+  <React.StrictMode>
+    <QueryClientProvider client={client}>
+      <BrowserRouter>
+        <App />
+      </BrowserRouter>
+    </QueryClientProvider>
+  </React.StrictMode>
+);