Add Rate Monitor app — Booking.com + direct booking engine competitor rates

Combines Booking.com Playwright scraper (from forecasting), direct booking
engine scraper (ported from laptop-archive/guestline-monitor), and Newbook
own-hotel rates into one focused tool. Four views: Bookability, Market View
(with price index badges + direct rate sub-rows), Direct Rates (per-competitor
room breakdown, min-stay flags, hotel config/discovery), Rate Analysis
(advance purchase curve, DOW chart, rate timeline, comparison table).

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

frontend/src/App.tsx

@@ -0,0 +1,28 @@
+import { Routes, Route, Navigate } from 'react-router-dom'
+import AuthGate from './components/AuthGate'
+import Layout from './components/Layout'
+import Bookability from './pages/Bookability'
+import MarketView from './pages/MarketView'
+import DirectRates from './pages/DirectRates'
+import RateAnalysis from './pages/RateAnalysis'
+import Settings from './pages/Settings'
+
+export default function App() {
+  return (
+    <AuthGate>
+      <Layout>
+        <Routes>
+          <Route path="/" element={<Navigate to="/bookability" replace />} />
+          <Route path="/bookability" element={<Bookability />} />
+          <Route path="/market" element={<MarketView />} />
+          <Route path="/direct" element={<DirectRates />} />
+          <Route path="/direct/:hotelId" element={<DirectRates />} />
+          <Route path="/analysis" element={<RateAnalysis />} />
+          <Route path="/settings" element={<Settings />} />
+          <Route path="/settings/:tab" element={<Settings />} />
+          <Route path="*" element={<Navigate to="/bookability" replace />} />
+        </Routes>
+      </Layout>
+    </AuthGate>
+  )
+}