Add React UI with Execution Explorer, auth, and standalone deployment

- Scaffold Vite + React + TypeScript frontend in ui/ with full design
  system (dark/light themes) matching the HTML mockups
- Implement Execution Explorer page: search filters, results table with
  expandable processor tree and exchange detail sidebar, pagination
- Add UI authentication: UiAuthController (login/refresh endpoints),
  JWT filter handles ui: subject prefix, CORS configuration
- Shared components: StatusPill, DurationBar, StatCard, AppBadge,
  FilterChip, Pagination — all using CSS Modules with design tokens
- API client layer: openapi-fetch with auth middleware, TanStack Query
  hooks for search/detail/snapshot queries, Zustand for state
- Standalone deployment: Nginx Dockerfile, K8s Deployment + ConfigMap +
  NodePort (30080), runtime config.js for API base URL
- Embedded mode: maven-resources-plugin copies ui/dist into JAR static
  resources, SPA forward controller for client-side routing
- CI/CD: UI build step, Docker build/push for server-ui image, K8s
  deploy step for UI, UI credential secrets

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

cameleer3-server-app/src/main/resources/application.yml

@@ -37,6 +37,9 @@ security:
   refresh-token-expiry-ms: 604800000
   bootstrap-token: ${CAMELEER_AUTH_TOKEN:}
   bootstrap-token-previous: ${CAMELEER_AUTH_TOKEN_PREVIOUS:}
+  ui-user: ${CAMELEER_UI_USER:admin}
+  ui-password: ${CAMELEER_UI_PASSWORD:admin}
+  ui-origin: ${CAMELEER_UI_ORIGIN:http://localhost:5173}
 
 springdoc:
   api-docs: