feat: replace create-app modal with full creation page at /apps/new

Full-page creation flow with:
- Identity section: name, auto-slug, environment, JAR upload, deploy toggle
- Monitoring tab: engine level, payload capture, log levels, metrics,
  sampling, compress success, replay, route control
- Resources tab: memory, CPU, ports, environment variables

Environment variables are configurable before first deploy, addressing
the need to set app-specific config upfront.

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

ui/src/router.tsx

@@ -68,6 +68,7 @@ export const router = createBrowserRouter([
 
           // Apps tab (OPERATOR+ via UI guard, shows all or single app)
           { path: 'apps', element: <SuspenseWrapper><AppsTab /></SuspenseWrapper> },
+          { path: 'apps/new', element: <SuspenseWrapper><AppsTab /></SuspenseWrapper> },
           { path: 'apps/:appId', element: <SuspenseWrapper><AppsTab /></SuspenseWrapper> },
 
           // Admin (ADMIN role required)