[ISSUE #4346] Clarify supported NameServer address formats

[Yanghanrui666]

Summary

• Add localized InfoBanner guidance to the NameServer create/edit and connection-test flows.
• Clarify that Studio connects directly from the server, so the address must be reachable from the Studio server.
• Document SLB/VIP, headless Service DNS, and comma-separated NameServer address examples in Chinese and English.
• Add focused Chinese and English regression coverage.

This supersedes #4365. The previous PR became unmergeable and was closed when the rocketmq-studio base branch was deleted; this branch is now rebased onto master.

Testing

• npm test -- src/pages/cluster/__tests__/ClusterPage.test.tsx --pool=threads --maxWorkers=1 — 27 passed
• npm run build — passed
• npm run lint — 0 errors (existing repository warnings only)
• Prettier check — passed

Fixes #4346

[RockteMQ-AI]

Summary

Good UX improvement — adds clear guidance text explaining what NameServer address formats are supported (SLB/VIP, Headless DNS, comma-separated list) and that the address must be reachable from the Studio server. Properly internationalized (zh/en) with tests covering both the guidance display and localization.

LGTM.

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