Addresses the device-management feedback:
- The MQTT server address is no longer hardcoded (was 10.10.90.110). It's
auto-detected from the address you open HomeOS at (App\Support\HostAddress —
request host + port), so it follows a DHCP/changed IP. MQTT_DEVICE_HOST is now
an optional override only. Settings + device page use it.
- Discovery dedup: a finding whose prefix already belongs to a device (assigned
OR auto-onboarded) no longer shows under "Neue Geräte" — fixes the device
appearing both in discovery and in Geräte.
- Delete device: confirm-guarded button on the device page; deleting frees the
discovery finding so the device can be re-added.
- "Neu scannen" button on the network page → publishes homeos/sidecar/rescan;
the sidecar (now a subscriber) re-queries mDNS. ACL grants it read on that
topic. paho-mqtt pinned to the v2 callback API.
+4 tests (host override/fallback, dedup, delete frees finding). Suite 62 green,
12/12 clean. Live-verified: rescan reaches sidecar; duplicate Shelly gone.
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
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