fix: fallback to the cached network information on failure

[allenporter]

Use the cached network info when looking up the latest network information fails.

[Copilot]

Pull request overview

This PR adds a fallback mechanism to use cached network information when retrieving the latest network information fails. The implementation renames the use_cache parameter to prefer_cache to better reflect its behavior and adds exception handling to fall back to cached data on network errors.

Key Changes

• Enhanced _get_networking_info() to fall back to cached network info when the MQTT network info request fails
• Renamed use_cache parameter to prefer_cache across all affected methods for clarity
• Added comprehensive test coverage for the new fallback behavior

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated 1 comment.

File	Description
roborock/devices/v1_channel.py	Implements fallback logic to use cached network info on failure and renames parameter from use_cache to prefer_cache
tests/devices/test_v1_channel.py	Adds test for fallback behavior, introduces shared cache fixture, and updates TEST_HOST to use centralized mock_data constant

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[Lash-L]

good outside copilot comments. can re-approve