Add capability-based room cleaning for MIoT vacuums

[eduardobittencourt]

Summary

This PR adds Home Assistant room-cleaning support for MIoT vacuum entities whose device spec exposes a room map and room-sweep actions.

Implementation

• Detects room-cleaning capability from the MIoT service spec (room_information, get_room_configs, and start_vacuum_room_sweep/start_room_sweep).
• Adds the standard Home Assistant CLEAN_AREA feature to compatible vacuum entities.
• Implements vacuum.get_segments room discovery and vacuum.clean_area segment routing.
• Parses the common MIoT room-information JSON payload and generates the room-selection payload.
• Keeps the implementation capability-based instead of adding a model-specific branch to vacuum platform setup.
• Ensures generated vacuum entity IDs use the vacuum domain when a previous vacuum integration has been removed from the entity registry.
• Adds unit coverage for room parsing and room-selection payload generation.

Validation

Validated with a Xiaomi X20 Pro D102GL using hass-xiaomi-miot in local/LAN mode on Home Assistant 2026.7.4:

• The vacuum entity loaded with CLEAN_AREA.
• vacuum/get_segments returned all 10 rooms from the robot map.
• No real cleaning action was triggered during validation.
• py_compile and git diff --check pass.
• Full pytest could not be run in the local environment because pytest was unavailable.