fix(status): separate cluster diagnostic states

[cxymds]

Description

Separates running-status diagnostics into independent peer health, storage readiness, usage freshness, listing/metacache, and workload-admission states.

The previous status model could conflate unavailable peer diagnostics with node or disk failures. This change consumes the optional backend-discovered cluster snapshot, preserves legacy status data for older servers, and prevents diagnostic endpoint timeouts from blocking the page.

The follow-up contract from rustfs/backlog#1392 is now reflected directly:

• snapshot.components.*.condition is authoritative over nested capability status
• unknown, not_reported, stale, and degraded remain distinct states
• omitted components on older backends are shown as not reported instead of inferred healthy or failed
• peer diagnostics degrade a node only for explicit failure evidence such as unreachable or unresolved
• internode_stall_timeouts_total is displayed as cumulative historical evidence and never changes current listing health by itself
• listing troubleshooting links to the real multi-node, time-windowed walk_dir metrics verification flow
• workload admission is displayed independently
• no S3 request behavior changes are included

Type of Change

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)
• Documentation update
• Code refactoring
• Performance improvement
• Test improvements
• Security fix

Testing

• Unit tests added/updated
• Manual testing completed

pnpm install --frozen-lockfile
pnpm tsc --noEmit
pnpm lint
pnpm prettier --check .
pnpm test:run

All 349 tests pass. The local Console route was started successfully, but end-to-end visual verification was blocked by the unavailable authenticated RustFS backend; semantic, responsive, old-backend fallback, and exact component-contract regression tests cover the changed behavior.

Checklist

• Code follows the project's style guidelines
• Self-review completed
• TypeScript types are properly defined
• All commit messages are in English (Conventional Commits)
• All existing tests pass
• No new dependencies added, or they are justified

Related Issues

Closes rustfs/backlog#1391
Closes rustfs/backlog#1392

Screenshots (if applicable)

Not included because the local backend session was not authenticated.

Additional Notes

The optional cluster snapshot request has an independent five-second timeout and never blocks the legacy status requests. Historical stall counters are deliberately presented without a current-health inference.

[houseme]

@codex review

[chatgpt-codex-connector]

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