fix: Lower log level for internal protocol connection details

[allenporter]

Lower noisy log messages for internal device manager connections state details across mqtt / local mixed channels. We'll instead rely on command failure symptoms and diagnose details with debug logs.

Fixes #616

[Copilot]

Pull request overview

This PR reduces log noise by lowering the severity level of internal protocol connection messages from warning to debug. These messages represent expected operational states in the device manager's fallback mechanism between MQTT and local channels, rather than actionable errors.

Key Changes:

• Changed command failure logs from warning to debug when falling back between channels
• Lowered connection state messages (already connected, connection lost, initial connection failures) to debug level
• Improved message clarity for the first local connection attempt to indicate retry behavior

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated no comments.

File	Description
roborock/devices/v1_channel.py	Reduced log levels for command failures on channels (line 93) and initial local connection attempts (line 285) to debug
roborock/devices/local_channel.py	Lowered "already connected" state (line 179) and connection loss events (line 217) to debug level

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