feat: add Applications admin page with version upload and deployments

- SplitPane layout with environment selector, app list, and detail pane
- Create/delete apps with slug uniqueness validation
- Upload JAR versions with file size display
- Deploy versions and stop running deployments with status badges
- Deployment list auto-refreshes every 5s for live status updates
- Registered at /admin/apps with sidebar entry

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

ui/src/router.tsx

@@ -18,6 +18,7 @@ const OidcConfigPage = lazy(() => import('./pages/Admin/OidcConfigPage'));
 const DatabaseAdminPage = lazy(() => import('./pages/Admin/DatabaseAdminPage'));
 const ClickHouseAdminPage = lazy(() => import('./pages/Admin/ClickHouseAdminPage'));
 const EnvironmentsPage = lazy(() => import('./pages/Admin/EnvironmentsPage'));
+const AppsPage = lazy(() => import('./pages/Admin/AppsPage'));
 const AppConfigPage = lazy(() => import('./pages/Admin/AppConfigPage'));
 const LogsPage = lazy(() => import('./pages/LogsTab/LogsPage'));
 const SwaggerPage = lazy(() => import('./pages/Swagger/SwaggerPage'));
@@ -83,6 +84,7 @@ export const router = createBrowserRouter([
                 { path: 'database', element: <SuspenseWrapper><DatabaseAdminPage /></SuspenseWrapper> },
                 { path: 'clickhouse', element: <SuspenseWrapper><ClickHouseAdminPage /></SuspenseWrapper> },
                 { path: 'environments', element: <SuspenseWrapper><EnvironmentsPage /></SuspenseWrapper> },
+                { path: 'apps', element: <SuspenseWrapper><AppsPage /></SuspenseWrapper> },
               ],
             }],
           },