Hotspot was reported as "not supported" on x86 machines (Ubuntu/Debian PCs)
because the Controller only watched the hardcoded default wlan0 device, while
predictable interface naming produces names like wlp2s0. The Settings page
saved hotspot_device to wrolpi.yaml, which the Controller never read.
The Controller now owns hotspot settings in controller.yaml:
* New endpoints: GET/POST /api/hotspot/settings, GET /api/hotspot/devices
(WiFi interfaces discovered via nmcli).
* Legacy hotspot_* values in wrolpi.yaml are migrated into controller.yaml
once on startup, unless controller.yaml already sets them.
* The Hotspot SSID/password/device fields moved from the Settings page to the
Control page next to the Hotspot toggle; the device is now a dropdown of
the WiFi devices found on the machine.
* The Controller fallback UI gets the same hotspot settings form for parity.
Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
