fix: Prevent caching unpicklable trait objects

DeviceFeaturesTrait and NetworkInfoTrait were storing entire trait objects
(including unpicklable _rpc_channel) in the cache, causing pickle errors
during cache.flush().

Now creates pure data-only instances for caching, excluding runtime objects
like _rpc_channel, _device_cache, and _nickname.

Fixes: AttributeError when flushing cache - "Can't pickle local object
'V1Channel.rpc_channel.<locals>.rpc_strategies_cb'"

Author: CiaranG

roborock/devices/traits/v1/device_features.py

@@ -34,7 +34,11 @@ async def refresh(self) -> None:
             return
         # Save cached device features
         await super().refresh()
-        cache_data.device_features = self
+        # Create a pure DeviceFeatures instance without runtime objects
+        device_features_data = DeviceFeatures()
+        for field in fields(DeviceFeatures):
+            setattr(device_features_data, field.name, getattr(self, field.name))
+        cache_data.device_features = device_features_data
         await self._device_cache.set(cache_data)
 
     def _parse_response(self, response: common.V1ResponseData) -> DeviceFeatures:

roborock/devices/traits/v1/network_info.py

@@ -3,6 +3,7 @@
 from __future__ import annotations
 
 import logging
+from dataclasses import fields
 
 from roborock.data import NetworkInfo
 from roborock.devices.cache import DeviceCache
@@ -45,7 +46,11 @@ async def refresh(self) -> None:
 
         # Update the cache with the new network info
         device_cache_data = await self._device_cache.get()
-        device_cache_data.network_info = self
+        # Create a pure NetworkInfo instance without runtime objects
+        network_info_data = NetworkInfo(ip="")
+        for field in fields(NetworkInfo):
+            setattr(network_info_data, field.name, getattr(self, field.name))
+        device_cache_data.network_info = network_info_data
         await self._device_cache.set(device_cache_data)
 
     def _parse_response(self, response: common.V1ResponseData) -> NetworkInfo: