feat: convert App Config detail to slide-in DetailPanel

Replaces the separate AppConfigDetailPage route with a 640px-wide
DetailPanel that slides in when clicking a row on the App Config
overview table. All editing functionality (settings, traces & taps,
route recording) is preserved inside the panel.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

ui/src/router.tsx

@@ -19,7 +19,6 @@ const OidcConfigPage = lazy(() => import('./pages/Admin/OidcConfigPage'));
 const DatabaseAdminPage = lazy(() => import('./pages/Admin/DatabaseAdminPage'));
 const OpenSearchAdminPage = lazy(() => import('./pages/Admin/OpenSearchAdminPage'));
 const AppConfigPage = lazy(() => import('./pages/Admin/AppConfigPage'));
-const AppConfigDetailPage = lazy(() => import('./pages/Admin/AppConfigDetailPage'));
 const SwaggerPage = lazy(() => import('./pages/Swagger/SwaggerPage'));
 
 function SuspenseWrapper({ children }: { children: React.ReactNode }) {
@@ -59,7 +58,6 @@ export const router = createBrowserRouter([
               { path: 'audit', element: <SuspenseWrapper><AuditLogPage /></SuspenseWrapper> },
               { path: 'oidc', element: <SuspenseWrapper><OidcConfigPage /></SuspenseWrapper> },
               { path: 'appconfig', element: <SuspenseWrapper><AppConfigPage /></SuspenseWrapper> },
-              { path: 'appconfig/:appId', element: <SuspenseWrapper><AppConfigDetailPage /></SuspenseWrapper> },
               { path: 'database', element: <SuspenseWrapper><DatabaseAdminPage /></SuspenseWrapper> },
               { path: 'opensearch', element: <SuspenseWrapper><OpenSearchAdminPage /></SuspenseWrapper> },
             ],