Issue 5: rooms couldn't be created or deleted.
- "Raum anlegen" button + CreateRoom modal (name + icon picker) on the rooms
index.
- Delete on the room page behind a confirm that states how many devices are in
it; on delete the devices are KEPT but moved to "no room" (room_id null).
3 tests. Suite green, 12/12 tabs clean.
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
Activates the Räume nav tab. Index lists rooms with online/lights/open counts;
show lists a room's devices with entity chips and switch/light toggles (through
DeviceCommandService), live via Echo. Zero console errors (nav check: 4/4 clean).
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
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