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/features/users/UsersPage.tsx

@@ -0,0 +1,41 @@
+import { useQuery } from "@tanstack/react-query";
+
+import { api } from "../../api/client";
+import { Page } from "../../components/Page";
+import { Table } from "../../components/Table";
+
+const columns = [
+  { key: "username", label: "Username" },
+  { key: "name", label: "Display name" },
+  { key: "role", label: "Role" },
+  { key: "status", label: "Status" }
+];
+
+export function UsersPage() {
+  const query = useQuery({
+    queryKey: ["users"],
+    queryFn: api.users
+  });
+
+  const rows = query.data?.map((user) => ({
+    username: user.username,
+    name: user.display_name,
+    role: user.role,
+    status: user.is_active ? "active" : "disabled"
+  })) ?? [];
+
+  return (
+    <Page
+      title="Users"
+      subtitle="Create, disable, and manage platform identities."
+      actions={<button className="button">New user</button>}
+    >
+      {query.isError ? <p className="notice">Unable to load users from the API.</p> : null}
+      <Table
+        columns={columns}
+        rows={rows}
+        renderCell={(row, column) => <span>{row[column.key as keyof (typeof rows)[number]]}</span>}
+      />
+    </Page>
+  );
+}