feat(listings): Listings shell+스타일+라우트 배선 + 청약 교차링크 + 문서

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01UHXzpsZQxKG9hQmNRfZjRS

src/routes.jsx

@@ -24,6 +24,7 @@ const Stock = lazy(() => import('./pages/stock/Stock'));
 const StockTrade = lazy(() => import('./pages/stock/StockTrade'));
 const Screener = lazy(() => import('./pages/stock/screener/Screener'));
 const Subscription = lazy(() => import('./pages/subscription/Subscription'));
+const Listings = lazy(() => import('./pages/listings/Listings'));
 const EffectLab = lazy(() => import('./pages/effect-lab/EffectLab'));
 const SwordStream = lazy(() => import('./pages/effect-lab/SwordStream'));
 const DayCalc = lazy(() => import('./pages/effect-lab/DayCalc'));
@@ -214,6 +215,10 @@ export const appRoutes = [
         path: 'realestate',
         element: <Subscription />,
     },
+    {
+        path: 'realestate/listings',
+        element: <Listings />,
+    },
     {
         path: 'travel',
         element: <Travel />,