feat: strip SaaS UI to vendor management dashboard

- Delete EnvironmentsPage, EnvironmentDetailPage, AppDetailPage
- Delete EnvironmentTree and DeploymentStatusBadge components
- Simplify DashboardPage to show tenant info, license status, server link
- Remove environment/app/deployment routes from router
- Remove environment section from sidebar, keep dashboard/license/platform
- Strip API hooks to tenant/license/me only
- Remove environment/app/deployment/observability types

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

ui/src/router.tsx

@@ -5,9 +5,6 @@ import { ProtectedRoute } from './auth/ProtectedRoute';
 import { OrgResolver } from './auth/OrgResolver';
 import { Layout } from './components/Layout';
 import { DashboardPage } from './pages/DashboardPage';
-import { EnvironmentsPage } from './pages/EnvironmentsPage';
-import { EnvironmentDetailPage } from './pages/EnvironmentDetailPage';
-import { AppDetailPage } from './pages/AppDetailPage';
 import { LicensePage } from './pages/LicensePage';
 import { AdminTenantsPage } from './pages/AdminTenantsPage';
 
@@ -26,9 +23,6 @@ export function AppRouter() {
         }
       >
         <Route index element={<DashboardPage />} />
-        <Route path="environments" element={<EnvironmentsPage />} />
-        <Route path="environments/:envId" element={<EnvironmentDetailPage />} />
-        <Route path="environments/:envId/apps/:appId" element={<AppDetailPage />} />
         <Route path="license" element={<LicensePage />} />
         <Route path="admin/tenants" element={<AdminTenantsPage />} />
       </Route>