feat(reliability-inbox): route local dem-dev stacks to localhost:10001

[ckbedwell]

Summary

• Map local SM apiHost values (localhost, 127.0.0.1, sm-api) to the k6-experiments reliability-inbox endpoint at http://localhost:10001.
• Relax isInitialReviewCandidate on local stacks so private simnet targets (e.g. *.dem.local.test) appear in the review list.
• Export isLocalReliabilityInboxStack() for reuse.

Test plan

• Unit tests for region URL mapping and local review filter (reliabilityInboxRegion.test.ts, model.test.ts)
• dem-dev + k6-experiments on localhost:10001 — Reliability Inbox shows reviewable opportunities without Graft

Related

• dem-dev: .local/Tiltfile hook for registering reliability-inbox as a local resource
• k6-experiments: CORS change for http://localhost Grafana origins (separate PR)