Implements EnvironmentsPage with DataTable, create modal, and row navigation,
and EnvironmentDetailPage with app list, inline rename, new app form with JAR
upload, and delete confirmation — all gated by RBAC permissions.
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
Wires up AppShell + Sidebar compound component, a per-environment
SidebarTree that lazy-fetches apps, React Router nested routes, and
provider-wrapped main.tsx with ThemeProvider/ToastProvider/BreadcrumbProvider.
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
