[Console] Migrate E2E Page Objects to webapp-v2 (Naive UI)

## Summary

**Parent:** #4414  
**Depends on:** #4415 merged

Update `streampark-e2e` Page Objects and selectors from Ant Design Vue DOM to Naive UI (`NDataTable`, `NForm`, etc.).

## Notes

E2E currently targets v1 Ant Design structure; run after v2 stabilizes.

## Acceptance

- [ ] Core E2E suites pass against webapp-v2 default UI
- [ ] Document local E2E setup with webapp-v2