feat: rename WHM→NixServer, cPanel→NixClient, bump v0.2.0

- Rename frontend workspaces: whm/ → nixserver/, cpanel/ → nixclient/
- Rename server route dirs: routes/whm/ → routes/nixserver/, routes/cpanel/ → routes/nixclient/
- Update all API prefixes: /api/whm → /api/nixserver, /api/cpanel → /api/nixclient
- Rename env vars: WHM_PORT → NIXSERVER_PORT, CPANEL_PORT → NIXCLIENT_PORT
- Update config properties: whmPort → nixserverPort, cpanelPort → nixclientPort
- Update all UI labels, login pages, sidebar branding, and error messages
- Update installer and update scripts to match new names
- Add cpanel email route (missing from initial scaffold)
- Add .gitattributes to enforce LF line endings
- Bump version to 0.2.0 across all package.json files

nixclient/src/App.tsx

@@ -0,0 +1,56 @@
+import React from 'react'
+import { BrowserRouter, Routes, Route, Navigate } from 'react-router-dom'
+import { AuthProvider, useAuth } from './contexts/AuthContext'
+import Layout from './components/Layout'
+import Login from './pages/Login'
+import Overview from './pages/Overview'
+import FileManager from './pages/FileManager'
+import Databases from './pages/Databases'
+import Email from './pages/Email'
+import SSL from './pages/SSL'
+import Domains from './pages/Domains'
+import FTP from './pages/FTP'
+import CronJobs from './pages/CronJobs'
+import Stats from './pages/Stats'
+
+function ProtectedRoute({ children }: { children: React.ReactNode }) {
+  const { user, loading } = useAuth()
+  if (loading) return (
+    <div className="min-h-screen bg-[#0a0f1a] flex items-center justify-center">
+      <div className="w-6 h-6 border-2 border-sky-500 border-t-transparent rounded-full animate-spin" />
+    </div>
+  )
+  if (!user) return <Navigate to="/login" replace />
+  return <>{children}</>
+}
+
+function AppRoutes() {
+  const { user } = useAuth()
+  return (
+    <Routes>
+      <Route path="/login" element={user ? <Navigate to="/" replace /> : <Login />} />
+      <Route path="/" element={<ProtectedRoute><Layout /></ProtectedRoute>}>
+        <Route index element={<Overview />} />
+        <Route path="files" element={<FileManager />} />
+        <Route path="databases" element={<Databases />} />
+        <Route path="email" element={<Email />} />
+        <Route path="ssl" element={<SSL />} />
+        <Route path="domains" element={<Domains />} />
+        <Route path="ftp" element={<FTP />} />
+        <Route path="cron" element={<CronJobs />} />
+        <Route path="stats" element={<Stats />} />
+      </Route>
+      <Route path="*" element={<Navigate to="/" replace />} />
+    </Routes>
+  )
+}
+
+export default function App() {
+  return (
+    <BrowserRouter>
+      <AuthProvider>
+        <AppRoutes />
+      </AuthProvider>
+    </BrowserRouter>
+  )
+}