842 soulhome updates

[tickBit]

Brief description

Related: #842 part 5.

Adds MQTT support and documentation for Soul Home room changes. The backend can now notify clients when room layout updates are saved through PUT /room, supporting both single-room and batch room updates, and when rooms are activated.

Change list

• Added RoomNotifier for Soul Home room MQTT notifications.
• Added layout update notification after successful PUT /room save.
• Added support for mode: 'single' | 'batch' in layout update payloads.
• Added room activation MQTT notification.
• Updated room activation to use deactivationTime and RoomStatus.ACTIVE.
• Registered RoomNotifier in application and test modules.
• Added notifier and service tests for Soul Home room MQTT behavior.
• Added Soulhome MQTT documentation.
• Updated common MQTT notification contract documentation.
• Added Soulhome MQTT documentation link to README.md.

[codecov-alt]

Codecov Report

✅ All modified and coverable lines are covered by tests.

Files with missing lines	Coverage Δ
src/clanInventory/room/room.notifier.ts	100.00% <100.00%> (ø)
src/clanInventory/room/room.service.ts	95.69% <100.00%> (+0.51%)	⬆️

... and 3 files with indirect coverage changes

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[CapoMK25]

Solid work, approved!