Allow per-device removal from the integration

HA blocks "Delete device" (and the equivalent
config/device_registry/remove_config_entry WS call) unless an
integration implements async_remove_config_entry_device. Add the
hook returning True so users can prune devices that are gone from
their Samsung Find account without editing the registry by hand.
A returning device with the same dvceID will be recreated on the
next coordinator setup.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

custom_components/smartthings_find/__init__.py

@@ -90,6 +90,18 @@ async def async_setup_entry(hass: HomeAssistant, entry: ConfigEntry) -> bool:
     )
     return True
 
+async def async_remove_config_entry_device(
+    hass: HomeAssistant, entry: ConfigEntry, device
+) -> bool:
+    """Allow the user to remove a device from this config entry.
+
+    Returning True unconditionally lets HA delete the device + its entities
+    from the registry. If the same dvceID later reappears in Samsung's
+    response, the next setup will recreate fresh entries for it.
+    """
+    return True
+
+
 async def async_unload_entry(hass: HomeAssistant, entry: ConfigEntry) -> bool:
     """Unload a config entry."""
     unload_success = await hass.config_entries.async_unload_platforms(entry, PLATFORMS)