feat: implement dynamic map update listeners and filtering on HomeTrait

[allenporter]

Motivation

With Home Assistant moving towards supporting dynamic devices (resolving home-assistant/core#175400), the integration needs the ability to add and remove map/camera entities at runtime without requiring a full integration reload.

Previously, HomeTrait:

1. Had no listener pattern to notify callers of updates.
2. Did not clean up deleted maps from the home_map_info cache when they were removed on the device, meaning stale maps remained present in Home Assistant indefinitely.

This PR adds a standard update listener pattern to HomeTrait and implements dynamic map eviction so callers can dynamically align their entities with the active map list.

Proposed Changes

roborock/devices/traits/v1/home.py

• Implement Trait Listener: Subclassed HomeTrait with TraitUpdateListener and triggered self._notify_update() when the cache is loaded, updated, or when a refresh concludes.
• Immediate Callbacks at Subscription: Overrode add_update_listener to immediately execute the callback with the initial state if home_map_info is already populated. This allows subscribers to use a single code path for initial entity generation and subsequent updates.
• Dynamic Map Eviction: Updated home_map_info and home_map_content properties to dynamically filter and return only maps that are currently active on the device (self._maps_trait.map_info). Stale map entries are omitted at lookup time, keeping the refresh() logic extremely clean and free of cache-eviction/file-writing complexity.

Testing

• Added unit test test_home_trait_listener_notifications to verify callback triggers on cache loads, discovery updates, refreshes, and immediate callbacks at subscription time.
• Added unit test test_home_trait_map_eviction to verify that deleted maps are dynamically excluded from lookup results when the device maps list updates.
• Ran the test suite: all 577 tests passed successfully.