* Add map rotation constants
Introduce rotation configuration constants for map image handling.
Adds rotation options (0, 90, 180, 270) and dispatcher signal name.
* Add per-map rotation select entity
Add SelectEntity to control map rotation per map_flag.
Rotation value is persisted via RestoreEntity and stored in hass.data.
Dispatcher signal notifies image entities when rotation changes.
* Enable rotation select platform and initialize storage
Register SELECT platform and initialize rotation storage in hass.data.
Add proper unload cleanup and reload behavior.
* Add backend map rotation with executor offloading
Implement backend image rotation using Pillow.
Rotation is applied in async_add_executor_job to avoid blocking the event loop.
Includes defensive validation and fallback handling.
* Add translations for rotation select entity
Add English and German translations for map rotation select entity.
Includes user-friendly labels for rotation options.
* Document map rotation select entity in README
Add documentation for the per-map rotation select entity.
Explains:
- How to rotate maps (0/90/180/270)
- Where to find the rotation select entity
- That calibration points are rotated as well
- That no reload is required
Also clarifies usage with Xiaomi Vacuum Map Card.
* Apply suggestions from code review
Co-authored-by: Copilot <175728472+Copilot@users.noreply.github.com>
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Co-authored-by: Luke Lashley <conway220@gmail.com>
Co-authored-by: Copilot <175728472+Copilot@users.noreply.github.com>
