Release: issue templates, optimistic flows, seeder health, CI fixes

[tashda]

Summary

Bundles the work that has accumulated on `dev` since v1.2.0:

• GitHub issue templates — adds `bug_report.yml`, `feature_request.yml`, and `config.yml` under `.github/ISSUE_TEMPLATE/` so the New issue page stops dropping users straight into a blank form.
• Seeder MQTT diagnostics — new `/api/health` endpoint and clearer 503 messages on the test-center control plane; surfaces broker connection state and seed completion so failed scenarios are debuggable without reading logs.
• Device flows — optimistic device rename, optimistic remove with Deleting badge, Recently Added section, interview indicator, fix for device detail title not updating after rename.
• Mock bridge — native macOS launcher (drops Docker on Full CI), HTTP test center for scenario-driven testing.
• CI — Full CI workflow stabilization (parallelism tuning, simctl bootstatus, cancel-on-failure), Prepare Release PR step fix, drop UI tests from Full CI during redesign.
• UI — Fan card redesign, Permit Join active sheet redesign, Settings Logging restructure.

Test plan

• Fast CI passes on PR
• After merge, confirm GitHub New issue page shows the bug / feature templates
• Spin up mock bridge and hit `GET /api/health` to verify diagnostics

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