dangernoodle-io / TaipanMiner / 26765597179

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feat(knot): advertise web-UI availability via mDNS + disable dead hostname links (#483)

Add a `ui` TXT key ("0" or "1") to the mDNS advertisement, driven by
CONFIG_WEBUI_MINING_UI. Both the provisioning and mining mDNS blocks are
updated. The esp32-s2-mini has CONFIG_WEBUI_MINING_UI=n and will advertise
"ui=0"; all other boards advertise "ui=1".

Back-compat default: older firmware that never sends the `ui` key is treated
as ui=true (link enabled) — `knot_table_apply_txt` sets `peer->ui = true`
before the TXT loop so an absent key leaves it enabled. `knot_set_self` also
sets `ui` from the same Kconfig value.

`build_knot_peer_json` emits `"ui":bool` in /api/knot. The Knot page renders
the hostname as a plain `<span class="name nolink">` when `peer.ui === false`,
with a tooltip explaining the reason, and keeps the `<a>` link when true or
undefined. Golden-string tests updated; three new ui-parse tests added to
`knot_table_apply_txt`; two new Knot.test.ts assertions cover the nolink/link
rendering paths.

Co-authored-by: Claude Opus 4.8 <noreply@anthropic.com>

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