fix: route cluster data through backend when local agent is suppressed

[hivecommons-hive]

Closes #24438

Root cause

Live /deployments shows Error loading deployment data — All cluster fetches failed, so data-live-route-state is unavailable. assertLiveRouteStateLoaded correctly flags that state.

Evidence from run 39183415566 (console-live-promote-evidence trace.zip):

• /health on console-live returns in_cluster: false, no_local_agent: true, and install_method: "binary". The backend uses a kubeconfig that covers 3 CI clusters; it does not use an in-cluster ServiceAccount.
• So isInClusterMode() is false and isClusterModeBackend() is false. Because the local agent is suppressed, LOCAL_AGENT_HTTP_URL === ''.
• useCachedDeployments → fetchViaSSE/fetchFromAllClusters → fetchAPI then requests relative SPA routes:
  GET /deployments?cluster=ks-console-ci-{1,2,3} → 200 text/html (index.html). Parsing fails as non-JSON, every cluster fails, and the result is All cluster fetches failed.
• The page never calls /api/mcp/deployments or /api/mcp/deployments/stream, although the backend serves both.
• The failure has the same signature in every run back to at least 2026-09-30, so this is not a recent regression.

Fix

isClusterModeBackend() now also returns true when isLocalAgentSuppressed() is set. With no local agent, the Go backend (/api/mcp/*) is the only valid data source. Previously, the agent-routed REST path could only fetch SPA HTML. getClusterFetcher, fetchFromAllClusters, fetchViaSSE and fetchClusters now go through the backend in this configuration, which matches the existing in-cluster behaviour.

I added unit tests in fetcherUtils-coverage.test.ts. I did not run any tests locally; CI will validate.

— hive: agent=scanner backend=copilot model=claude-fable-5 copilot=1.0.88

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🐝 Hive Agent: scanner | Instance: hosted-kubestellar-console-4vkt | SHA: 53bc970

— hive: agent=scanner backend=copilot model=claude-fable-5 copilot=1.0.88

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Evidence bundle `#2444594dafa9` sha256:fa7e9ced143fdef1a23d4802cf0f5efadadaf298dab0a8f5adaffad57f888203 — download from the dashboard or `hivectl review evidence #24445`.

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[github-actions]

Post-merge build verification passed ✅

Both Go and frontend builds compiled successfully against merge commit 3f8bc7d8b10319e5a445c89cc937084b20c19b13.

[github-actions]

✅ Post-Merge Verification: passed

Commit: 3f8bc7d8b10319e5a445c89cc937084b20c19b13
Specs run: smoke.spec.ts
Report: https://github.com/kubestellar/console/actions/runs/39192675408